diff --git a/testutil/sample/crosschain.go b/testutil/sample/crosschain.go
index 293dbff61f..db0b943964 100644
--- a/testutil/sample/crosschain.go
+++ b/testutil/sample/crosschain.go
@@ -149,7 +149,10 @@ func GasPriceWithChainID(t *testing.T, chainID int64) types.GasPrice {
 }
 
 func GasPriceFromRand(r *rand.Rand, chainID int64) *types.GasPrice {
-	price := r.Uint64()
+	var price uint64
+	for price == 0 {
+		price = r.Uint64()
+	}
 	priorityFee := r.Uint64() % price
 	return &types.GasPrice{
 		Creator:      "",
@@ -367,7 +370,7 @@ func InboundVoteFromRand(from, to int64, r *rand.Rand, asset string) types.MsgVo
 		Receiver:           EthAddressFromRand(r).String(),
 		ReceiverChain:      to,
 		Amount:             math.NewUint(r.Uint64()),
-		Message:            base64.StdEncoding.EncodeToString(RandomBytes(r)),
+		Message:            "95222290DD7278Aa3Ddd389Cc1E1d165CC4BAfe5",
 		InboundBlockHeight: r.Uint64(),
 		CallOptions: &types.CallOptions{
 			GasLimit: 1000000000,
diff --git a/testutil/sample/crypto.go b/testutil/sample/crypto.go
index 4f62878d0f..b67698bca0 100644
--- a/testutil/sample/crypto.go
+++ b/testutil/sample/crypto.go
@@ -33,30 +33,13 @@ func PubKeySet() *crypto.PubKeySet {
 	return &pubKeySet
 }
 
-func Secp256PrivateKeyFromRand(r *rand.Rand) secp256k1.PrivKey {
+func Ed25519PrivateKeyFromRand(r *rand.Rand) (*ed25519.PrivKey, error) {
 	randomBytes := make([]byte, 32)
 	_, err := r.Read(randomBytes)
 	if err != nil {
-		panic(err)
-	}
-	return secp256k1.GenPrivKeySecp256k1(randomBytes)
-}
-
-func Ed25519PrivateKeyFromRand(r *rand.Rand) *ed25519.PrivKey {
-	randomBytes := make([]byte, 32)
-	_, err := r.Read(randomBytes)
-	if err != nil {
-		panic(err)
+		return nil, err
 	}
-	return ed25519.GenPrivKeyFromSecret(randomBytes)
-}
-
-func PubKeySetFromRand(r *rand.Rand) *crypto.PubKeySet {
-	pubKeySet := crypto.PubKeySet{
-		Secp256k1: crypto.PubKey(Secp256PrivateKeyFromRand(r).PubKey().Bytes()),
-		Ed25519:   crypto.PubKey(Ed25519PrivateKeyFromRand(r).PubKey().String()),
-	}
-	return &pubKeySet
+	return ed25519.GenPrivKeyFromSecret(randomBytes), nil
 }
 
 // PubKeyString returns a sample public key string
@@ -73,17 +56,17 @@ func PubKeyString() string {
 	return pubkey.String()
 }
 
-func PubkeyStringFromRand(r *rand.Rand) string {
-	priKey := Ed25519PrivateKeyFromRand(r)
+func PubkeyStringFromRand(r *rand.Rand) (string, error) {
+	priKey, err := Ed25519PrivateKeyFromRand(r)
 	s, err := cosmos.Bech32ifyPubKey(cosmos.Bech32PubKeyTypeAccPub, priKey.PubKey())
 	if err != nil {
-		panic(err)
+		return "", err
 	}
 	pubkey, err := crypto.NewPubKey(s)
 	if err != nil {
-		panic(err)
+		return "", err
 	}
-	return pubkey.String()
+	return pubkey.String(), nil
 }
 
 // PrivKeyAddressPair returns a private key, address pair
diff --git a/testutil/sample/observer.go b/testutil/sample/observer.go
index 794e5ea4de..20136593b0 100644
--- a/testutil/sample/observer.go
+++ b/testutil/sample/observer.go
@@ -116,11 +116,7 @@ func ChainParams(chainID int64) *types.ChainParams {
 }
 
 func ChainParamsFromRand(r *rand.Rand, chainID int64) *types.ChainParams {
-	fiftyPercent, err := sdk.NewDecFromStr("0.5")
-	if err != nil {
-		return nil
-	}
-
+	fiftyPercent := sdk.MustNewDecFromStr("0.5")
 	return &types.ChainParams{
 		ChainId:           chainID,
 		ConfirmationCount: r.Uint64(),
diff --git a/x/crosschain/simulation/operation_abort_stuck_cctx.go b/x/crosschain/simulation/operation_abort_stuck_cctx.go
index 198ae1d523..f828b8f5d7 100644
--- a/x/crosschain/simulation/operation_abort_stuck_cctx.go
+++ b/x/crosschain/simulation/operation_abort_stuck_cctx.go
@@ -1,7 +1,6 @@
 package simulation
 
 import (
-	"fmt"
 	"math/rand"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
@@ -47,7 +46,11 @@ func SimulateMsgAbortStuckCCTX(k keeper.Keeper) simtypes.Operation {
 
 		tss, found := k.GetObserverKeeper().GetTSS(ctx)
 		if !found {
-			return simtypes.OperationMsg{}, nil, fmt.Errorf("tss not found")
+			return simtypes.NoOpMsg(
+				types.ModuleName,
+				types.TypeMsgAbortStuckCCTX,
+				"no TSS found",
+			), nil, nil
 		}
 
 		pendingNonces, found := k.GetObserverKeeper().GetPendingNonces(ctx, tss.TssPubkey, chainID)
@@ -63,7 +66,7 @@ func SimulateMsgAbortStuckCCTX(k keeper.Keeper) simtypes.Operation {
 		if pendingNonces.NonceLow == pendingNonces.NonceHigh {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
-				types.TypeMsgAddOutboundTracker,
+				types.TypeMsgAbortStuckCCTX,
 				"no pending nonces found",
 			), nil, nil
 		}
diff --git a/x/crosschain/simulation/operation_gas_price_voter.go b/x/crosschain/simulation/operation_gas_price_voter.go
index 299ac9d03e..5f0d4c7690 100644
--- a/x/crosschain/simulation/operation_gas_price_voter.go
+++ b/x/crosschain/simulation/operation_gas_price_voter.go
@@ -1,7 +1,6 @@
 package simulation
 
 import (
-	"fmt"
 	"math/rand"
 
 	"github.com/cosmos/cosmos-sdk/baseapp"
@@ -39,8 +38,12 @@ func SimulateMsgVoteGasPrice(k keeper.Keeper) simtypes.Operation {
 		randomChainID := GetRandomChainID(r, supportedChains)
 
 		// Vote for random gas price. Gas prices do not use a ballot system, so we can vote directly without having to schedule future operations.
-		// The random nature of the price might create weird gas prices for the chain, but it is fine for now. We can remove the randomness if needed
-		price := r.Uint64()
+
+		var price uint64
+		for price == 0 {
+			maxGasPrice := uint64(1000 * 1e9) // 1000 Gwei
+			price = uint64(1e9) + r.Uint64()%maxGasPrice
+		}
 		// Select priority fee between 0 and price
 		priorityFee := r.Uint64() % price
 		msg := types.MsgVoteGasPrice{
@@ -48,8 +51,8 @@ func SimulateMsgVoteGasPrice(k keeper.Keeper) simtypes.Operation {
 			ChainId:     randomChainID,
 			Price:       price,
 			PriorityFee: priorityFee,
-			BlockNumber: r.Uint64(),
-			Supply:      fmt.Sprintf("%d", r.Int63()),
+			BlockNumber: uint64(ctx.BlockHeight()) + r.Uint64()%1000,
+			Supply:      sdk.NewInt(r.Int63n(1e18)).String(),
 		}
 
 		// System contracts are deployed on the first block, so we cannot vote on gas prices before that
diff --git a/x/crosschain/simulation/operation_migrate_erc20_custody_funds.go b/x/crosschain/simulation/operation_migrate_erc20_custody_funds.go
index 81ae8f11d0..ff486b27e7 100644
--- a/x/crosschain/simulation/operation_migrate_erc20_custody_funds.go
+++ b/x/crosschain/simulation/operation_migrate_erc20_custody_funds.go
@@ -21,7 +21,7 @@ func SimulateMigrateERC20CustodyFunds(k keeper.Keeper) simtypes.Operation {
 	) (OperationMsg simtypes.OperationMsg, futureOps []simtypes.FutureOperation, err error) {
 		policyAccount, err := GetPolicyAccount(ctx, k.GetAuthorityKeeper(), accounts)
 		if err != nil {
-			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgWhitelistERC20, err.Error()), nil, nil
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgMigrateERC20CustodyFunds, err.Error()), nil, nil
 		}
 
 		authAccount := k.GetAuthKeeper().GetAccount(ctx, policyAccount.Address)
@@ -99,7 +99,7 @@ func SimulateMigrateERC20CustodyFunds(k keeper.Keeper) simtypes.Operation {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
 				msg.Type(),
-				"unable to validate MsgRemoveOutboundTracker msg",
+				"unable to validate MsgMigrateERC20CustodyFunds",
 			), nil, err
 		}
 
diff --git a/x/crosschain/simulation/operation_remove_outbound_tracker.go b/x/crosschain/simulation/operation_remove_outbound_tracker.go
index 6bfe453a37..6eaa52be81 100644
--- a/x/crosschain/simulation/operation_remove_outbound_tracker.go
+++ b/x/crosschain/simulation/operation_remove_outbound_tracker.go
@@ -48,7 +48,7 @@ func SimulateMsgRemoveOutboundTracker(k keeper.Keeper) simtypes.Operation {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
 				msg.Type(),
-				"unable to validate MsgRemoveOutboundTracker msg",
+				"unable to validate MsgRemoveOutboundTracker",
 			), nil, err
 		}
 
diff --git a/x/crosschain/simulation/operation_update_erc20_pause_status.go b/x/crosschain/simulation/operation_update_erc20_pause_status.go
index 0091a49f01..a4fa5b30c0 100644
--- a/x/crosschain/simulation/operation_update_erc20_pause_status.go
+++ b/x/crosschain/simulation/operation_update_erc20_pause_status.go
@@ -20,7 +20,7 @@ func SimulateUpdateERC20CustodyPauseStatus(k keeper.Keeper) simtypes.Operation {
 	) (OperationMsg simtypes.OperationMsg, futureOps []simtypes.FutureOperation, err error) {
 		policyAccount, err := GetPolicyAccount(ctx, k.GetAuthorityKeeper(), accounts)
 		if err != nil {
-			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgWhitelistERC20, err.Error()), nil, nil
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeUpdateERC20CustodyPauseStatus, err.Error()), nil, nil
 		}
 
 		authAccount := k.GetAuthKeeper().GetAccount(ctx, policyAccount.Address)
@@ -38,7 +38,7 @@ func SimulateUpdateERC20CustodyPauseStatus(k keeper.Keeper) simtypes.Operation {
 		filteredChains := chains.FilterChains(supportedChains, chains.FilterExternalChains)
 
 		//pick a random chain
-		randomChain := supportedChains[r.Intn(len(filteredChains))]
+		randomChain := filteredChains[r.Intn(len(filteredChains))]
 
 		_, found := k.GetObserverKeeper().GetChainNonces(ctx, randomChain.ChainId)
 		if !found {
@@ -96,7 +96,7 @@ func SimulateUpdateERC20CustodyPauseStatus(k keeper.Keeper) simtypes.Operation {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
 				msg.Type(),
-				"unable to validate MsgRemoveOutboundTracker msg",
+				"unable to validate MsgUpdateERC20CustodyPauseStatus msg",
 			), nil, err
 		}
 
diff --git a/x/crosschain/simulation/operation_update_tss_address.go b/x/crosschain/simulation/operation_update_tss_address.go
index 6cec61ae77..aac70b512b 100644
--- a/x/crosschain/simulation/operation_update_tss_address.go
+++ b/x/crosschain/simulation/operation_update_tss_address.go
@@ -21,7 +21,7 @@ func SimulateMsgUpdateTssAddress(k keeper.Keeper) simtypes.Operation {
 	) (OperationMsg simtypes.OperationMsg, futureOps []simtypes.FutureOperation, err error) {
 		policyAccount, err := GetPolicyAccount(ctx, k.GetAuthorityKeeper(), accounts)
 		if err != nil {
-			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgWhitelistERC20, err.Error()), nil, nil
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgUpdateTssAddress, err.Error()), nil, nil
 		}
 
 		authAccount := k.GetAuthKeeper().GetAccount(ctx, policyAccount.Address)
@@ -105,7 +105,7 @@ func SimulateMsgUpdateTssAddress(k keeper.Keeper) simtypes.Operation {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
 				msg.Type(),
-				"unable to validate MsgRemoveOutboundTracker msg",
+				"unable to validate MsgUpdateTssAddress msg",
 			), nil, err
 		}
 
diff --git a/x/crosschain/simulation/operation_vote_outbound.go b/x/crosschain/simulation/operation_vote_outbound.go
index 54cae05a58..51f7113c2c 100644
--- a/x/crosschain/simulation/operation_vote_outbound.go
+++ b/x/crosschain/simulation/operation_vote_outbound.go
@@ -90,7 +90,7 @@ func SimulateVoteOutbound(k keeper.Keeper) simtypes.Operation {
 
 		tss, found := k.GetObserverKeeper().GetTSS(ctx)
 		if !found {
-			return simtypes.OperationMsg{}, nil, fmt.Errorf("tss not found")
+			return simtypes.NoOpMsg(types.ModuleName, authz.OutboundVoter.String(), "tss not found"), nil, nil
 		}
 
 		asset, err := GetAsset(ctx, k.GetFungibleKeeper(), from)
diff --git a/x/crosschain/simulation/operation_whitelist_erc20.go b/x/crosschain/simulation/operation_whitelist_erc20.go
index bbc654f740..b67cad6a44 100644
--- a/x/crosschain/simulation/operation_whitelist_erc20.go
+++ b/x/crosschain/simulation/operation_whitelist_erc20.go
@@ -37,6 +37,13 @@ func SimulateMsgWhitelistERC20(k keeper.Keeper) simtypes.Operation {
 		}
 
 		filteredChains := chains.FilterChains(supportedChains, chains.FilterByVM(chains.Vm_evm))
+		if len(filteredChains) == 0 {
+			return simtypes.NoOpMsg(
+				types.ModuleName,
+				types.TypeMsgWhitelistERC20,
+				"no EVM-compatible chains found",
+			), nil, nil
+		}
 
 		//pick a random chain
 		// Keep the switch case to add solana support in future
@@ -116,7 +123,7 @@ func SimulateMsgWhitelistERC20(k keeper.Keeper) simtypes.Operation {
 			return simtypes.NoOpMsg(
 				types.ModuleName,
 				msg.Type(),
-				"unable to validate MsgRemoveOutboundTracker msg",
+				"unable to validate MsgWhitelistERC20",
 			), nil, err
 		}
 
diff --git a/x/crosschain/simulation/operations.go b/x/crosschain/simulation/operations.go
index 0b4765f0f5..0400b74231 100644
--- a/x/crosschain/simulation/operations.go
+++ b/x/crosschain/simulation/operations.go
@@ -57,7 +57,7 @@ const (
 	OpWeightUpdateRateLimiterFlags        = "op_weight_msg_update_rate_limiter_flags"         // #nosec G101 not a hardcoded credential
 	OpWeightRefundAbortedCCTX             = "op_weight_msg_refund_aborted_cctx"               // #nosec G101 not a hardcoded credential
 	OpWeightUpdateERC20CustodyPauseStatus = "op_weight_msg_update_erc20_custody_pause_status" // #nosec G101 not a hardcoded credential
-	OppWeightMigrateERC20CustodyFunds     = "op_weight_msg_migrate_erc20_custody_funds"       // #nosec G101 not a hardcoded credential
+	OpWeightMigrateERC20CustodyFunds      = "op_weight_msg_migrate_erc20_custody_funds"       // #nosec G101 not a hardcoded credential
 
 )
 
@@ -158,7 +158,7 @@ func WeightedOperations(
 		},
 	)
 
-	appParams.GetOrGenerate(cdc, OppWeightMigrateERC20CustodyFunds, &weightMigrateERC20CustodyFunds, nil,
+	appParams.GetOrGenerate(cdc, OpWeightMigrateERC20CustodyFunds, &weightMigrateERC20CustodyFunds, nil,
 		func(_ *rand.Rand) {
 			weightMigrateERC20CustodyFunds = DefaultWeightMigrateERC20CustodyFunds
 		},
diff --git a/x/fungible/keeper/deposits.go b/x/fungible/keeper/deposits.go
index 60e8f5e6af..3a5c24d1bb 100644
--- a/x/fungible/keeper/deposits.go
+++ b/x/fungible/keeper/deposits.go
@@ -37,7 +37,6 @@ func (k Keeper) ZRC20DepositAndCallContract(
 	protocolContractVersion crosschaintypes.ProtocolContractVersion,
 	isCrossChainCall bool,
 ) (*evmtypes.MsgEthereumTxResponse, bool, error) {
-	//fmt.Println("start ZRC20DepositAndCallContract", asset, senderChainID)
 	// get ZRC20 contract
 	zrc20Contract, _, err := k.getAndCheckZRC20(ctx, amount, senderChainID, coinType, asset)
 	if err != nil {
diff --git a/x/observer/simulation/decoders.go b/x/observer/simulation/decoders.go
index 30da902c6e..6ebf8514c9 100644
--- a/x/observer/simulation/decoders.go
+++ b/x/observer/simulation/decoders.go
@@ -91,7 +91,7 @@ func NewDecodeStore(cdc codec.Codec) func(kvA, kvB kv.Pair) string {
 			cdc.MustUnmarshal(kvB.Value, &paramsB)
 			return fmt.Sprintf("%v\n%v", paramsA, paramsB)
 		default:
-			panic(fmt.Sprintf("invalid observer key prefix %X", kvA.Key[:1]))
+			panic(fmt.Sprintf("invalid observer key prefix %X (first 8 bytes: %X)", kvA.Key[:1], kvA.Key[:min(8, len(kvA.Key))]))
 		}
 	}
 }
diff --git a/x/observer/simulation/operation_add_observer.go b/x/observer/simulation/operation_add_observer.go
index f5d147832f..95eff5ddbb 100644
--- a/x/observer/simulation/operation_add_observer.go
+++ b/x/observer/simulation/operation_add_observer.go
@@ -60,11 +60,14 @@ func SimulateAddObserver(k keeper.Keeper) simtypes.Operation {
 				"no node accounts available which can be added as observer",
 			), nil, nil
 		}
-
+		pubkey, err := sample.PubkeyStringFromRand(r)
+		if err != nil {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgAddObserver, err.Error()), nil, nil
+		}
 		msg := types.MsgAddObserver{
 			Creator:                 policyAccount.Address.String(),
 			ObserverAddress:         newObserver,
-			ZetaclientGranteePubkey: sample.PubkeyStringFromRand(r),
+			ZetaclientGranteePubkey: pubkey,
 			AddNodeAccountOnly:      false,
 		}
 
diff --git a/x/observer/simulation/operation_add_observer_node_account.go b/x/observer/simulation/operation_add_observer_node_account.go
index cbaca90f68..e182123fe1 100644
--- a/x/observer/simulation/operation_add_observer_node_account.go
+++ b/x/observer/simulation/operation_add_observer_node_account.go
@@ -75,10 +75,14 @@ func SimulateAddObserverNodeAccount(k keeper.Keeper) simtypes.Operation {
 			), nil, nil
 		}
 
+		pubkey, err := sample.PubkeyStringFromRand(r)
+		if err != nil {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgAddObserver, err.Error()), nil, nil
+		}
 		msg := types.MsgAddObserver{
 			Creator:                 policyAccount.Address.String(),
 			ObserverAddress:         newObserver,
-			ZetaclientGranteePubkey: sample.PubkeyStringFromRand(r),
+			ZetaclientGranteePubkey: pubkey,
 			AddNodeAccountOnly:      true,
 		}
 
diff --git a/x/observer/simulation/operation_disable_cctx.go b/x/observer/simulation/operation_disable_cctx.go
index 324a6ead76..9364aa2d87 100644
--- a/x/observer/simulation/operation_disable_cctx.go
+++ b/x/observer/simulation/operation_disable_cctx.go
@@ -19,7 +19,7 @@ func SimulateDisableCCTX(k keeper.Keeper) simtypes.Operation {
 	) (OperationMsg simtypes.OperationMsg, futureOps []simtypes.FutureOperation, err error) {
 		policyAccount, err := GetPolicyAccount(ctx, k.GetAuthorityKeeper(), accounts)
 		if err != nil {
-			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgUpdateKeygen, err.Error()), nil, nil
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgDisableCCTX, err.Error()), nil, nil
 		}
 		authAccount := k.GetAuthKeeper().GetAccount(ctx, policyAccount.Address)
 		spendable := k.GetBankKeeper().SpendableCoins(ctx, authAccount.GetAddress())
diff --git a/x/observer/simulation/operation_enable_cctx.go b/x/observer/simulation/operation_enable_cctx.go
index 3e963caa15..7ee1d06776 100644
--- a/x/observer/simulation/operation_enable_cctx.go
+++ b/x/observer/simulation/operation_enable_cctx.go
@@ -19,7 +19,7 @@ func SimulateEnableCCTX(k keeper.Keeper) simtypes.Operation {
 	) (OperationMsg simtypes.OperationMsg, futureOps []simtypes.FutureOperation, err error) {
 		policyAccount, err := GetPolicyAccount(ctx, k.GetAuthorityKeeper(), accounts)
 		if err != nil {
-			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgUpdateKeygen, err.Error()), nil, nil
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgEnableCCTX, err.Error()), nil, nil
 		}
 		authAccount := k.GetAuthKeeper().GetAccount(ctx, policyAccount.Address)
 		spendable := k.GetBankKeeper().SpendableCoins(ctx, authAccount.GetAddress())
@@ -27,7 +27,7 @@ func SimulateEnableCCTX(k keeper.Keeper) simtypes.Operation {
 		msg := types.MsgEnableCCTX{
 			Creator:        policyAccount.Address.String(),
 			EnableInbound:  true,
-			EnableOutbound: false,
+			EnableOutbound: true,
 		}
 
 		err = msg.ValidateBasic()
diff --git a/x/observer/simulation/operation_reset_chain_nonces.go b/x/observer/simulation/operation_reset_chain_nonces.go
index 709490aafa..38ccacac37 100644
--- a/x/observer/simulation/operation_reset_chain_nonces.go
+++ b/x/observer/simulation/operation_reset_chain_nonces.go
@@ -53,7 +53,7 @@ func SimulateResetChainNonces(k keeper.Keeper) simtypes.Operation {
 				fmt.Errorf("pending nonces not found for chain %d %s", randomChain.ChainId, randomChain.ChainName)
 		}
 
-		nonceIncrement := int64(r.Intn(100-1)) + 1
+		nonceIncrement := int64(r.Intn(99)) + 1
 
 		msg := types.MsgResetChainNonces{
 			Creator:        policyAccount.Address.String(),
diff --git a/x/observer/simulation/operation_update_chain_params.go b/x/observer/simulation/operation_update_chain_params.go
index ad4beb768c..21f45d9ee3 100644
--- a/x/observer/simulation/operation_update_chain_params.go
+++ b/x/observer/simulation/operation_update_chain_params.go
@@ -32,6 +32,10 @@ func SimulateUpdateChainParams(k keeper.Keeper) simtypes.Operation {
 		}
 
 		cp := sample.ChainParamsFromRand(r, randomChain.ChainId)
+		err = types.ValidateChainParams(cp)
+		if err != nil {
+			return simtypes.NoOpMsg(types.ModuleName, types.TypeMsgUpdateChainParams, err.Error()), nil, nil
+		}
 
 		msg := types.MsgUpdateChainParams{
 			Creator:     policyAccount.Address.String(),
diff --git a/x/observer/simulation/operations.go b/x/observer/simulation/operations.go
index d0acc1d020..84bc312de9 100644
--- a/x/observer/simulation/operations.go
+++ b/x/observer/simulation/operations.go
@@ -262,7 +262,7 @@ func GetRandomAccountAndObserver(
 	})
 
 	if !foundObserver {
-		return simtypes.Account{}, "no observer found", nil, nil
+		return simtypes.Account{}, "", nil, fmt.Errorf("no observer found")
 	}
 
 	simAccount, err := GetSimAccount(randomObserver, accounts)