diff --git a/packages/extension-core/src/domains/sitesAuthorised/store.ts b/packages/extension-core/src/domains/sitesAuthorised/store.ts
index 4315d823a5..b9602723ff 100644
--- a/packages/extension-core/src/domains/sitesAuthorised/store.ts
+++ b/packages/extension-core/src/domains/sitesAuthorised/store.ts
@@ -1,4 +1,3 @@
-import { assert } from "@polkadot/util"
 import { convertAddress } from "@talismn/util"
 
 import { SubscribableByIdStorageProvider } from "../../libs/Store"
@@ -8,6 +7,8 @@ import { AuthorizedSite, AuthorizedSites, ProviderType } from "./types"
 
 const OLD_AUTH_URLS_KEY = "authUrls"
 
+export class SitesAuthorizedError extends Error {}
+
 // exported only for test purposes
 export class SitesAuthorizedStore extends SubscribableByIdStorageProvider<
   AuthorizedSites,
@@ -49,15 +50,21 @@ export class SitesAuthorizedStore extends SubscribableByIdStorageProvider<
   ): Promise<boolean> {
     const entry = await this.getSiteFromUrl(url)
     const addresses = ethereum ? entry?.ethAddresses : entry?.addresses
-    assert(addresses, `Site ${url} has not been authorised for Talisman yet`)
-    assert(addresses.length, `No Talisman wallet accounts are authorised to connect to ${url}`)
+    if (!addresses) {
+      const message = `Site ${url} has not been authorised for Talisman yet`
+      throw new SitesAuthorizedError(message)
+    }
+    if (!addresses.length) {
+      const message = `No Talisman wallet accounts are authorised to connect to ${url}`
+      throw new SitesAuthorizedError(message)
+    }
 
     // check the supplied address is authorised to interact with this URL
-    if (address)
-      assert(
-        addresses.includes(convertAddress(address, null)),
-        `The source ${url} is not allowed to intract with this account.`
-      )
+    if (address && !addresses.includes(convertAddress(address, null))) {
+      const message = `The source ${url} is not allowed to interact with this account.`
+      throw new SitesAuthorizedError(message)
+    }
+
     return true
   }
 
diff --git a/packages/extension-core/src/domains/talisman/handler/rpc.ts b/packages/extension-core/src/domains/talisman/handler/rpc.ts
index 8119eb9f30..70ae5a0c30 100644
--- a/packages/extension-core/src/domains/talisman/handler/rpc.ts
+++ b/packages/extension-core/src/domains/talisman/handler/rpc.ts
@@ -1,5 +1,3 @@
-import assert from "assert"
-
 import { TabsHandler } from "../../../libs/Handler"
 import { chainConnector } from "../../../rpcs/chain-connector"
 import { chaindataProvider } from "../../../rpcs/chaindata"
@@ -12,6 +10,8 @@ import {
   UnknownJsonRpcResponse,
 } from "../types"
 
+export class ChaindataChainNotFoundError extends Error {}
+
 export default class TalismanRpcHandler extends TabsHandler {
   #talismanByGenesisHashSubscriptions = new Map<string, (unsubscribeMethod: string) => void>()
 
@@ -21,7 +21,8 @@ export default class TalismanRpcHandler extends TabsHandler {
     const { genesisHash, method, params } = request
 
     const chain = await chaindataProvider.chainByGenesisHash(genesisHash)
-    assert(chain, `Chain with genesisHash '${genesisHash}' not found`)
+    if (!chain)
+      throw new ChaindataChainNotFoundError(`Chain with genesisHash '${genesisHash}' not found`)
 
     return await chainConnector.send(chain.id, method, params)
   }
@@ -36,7 +37,8 @@ export default class TalismanRpcHandler extends TabsHandler {
     const { genesisHash, subscribeMethod, responseMethod, params, timeout } = request
 
     const chain = await chaindataProvider.chainByGenesisHash(genesisHash)
-    assert(chain, `Chain with genesisHash '${genesisHash}' not found`)
+    if (!chain)
+      throw new ChaindataChainNotFoundError(`Chain with genesisHash '${genesisHash}' not found`)
 
     const unsubscribe = await chainConnector.subscribe(
       chain.id,
diff --git a/packages/extension-core/src/handlers/index.ts b/packages/extension-core/src/handlers/index.ts
index 6e03f3b243..cbcc9f911c 100644
--- a/packages/extension-core/src/handlers/index.ts
+++ b/packages/extension-core/src/handlers/index.ts
@@ -3,7 +3,10 @@ import { PORT_EXTENSION } from "extension-shared"
 import { log } from "extension-shared"
 
 import { sentry } from "../config/sentry"
+import { TalismanNotOnboardedError } from "../domains/app/utils"
 import { cleanupEvmErrorMessage, getEvmErrorCause } from "../domains/ethereum/errors"
+import { SitesAuthorizedError } from "../domains/sitesAuthorised/store"
+import { ChaindataChainNotFoundError } from "../domains/talisman/handler/rpc"
 import { MessageTypes, TransportRequestMessage } from "../types"
 import { AnyEthRequest } from "../types/domains"
 import Extension from "./Extension"
@@ -124,11 +127,12 @@ const talismanHandler = <TMessageType extends MessageTypes>(
           rpcData: evmError.data, // don't use "data" as property name or viem will interpret it differently
           isEthProviderRpcError: true,
         })
-      } else {
-        // log to sentry because we need to know the traceback
-        sentry.captureException(error)
-        safePostMessage(port, { id, error: error.message })
+        return
       }
+
+      // log to sentry because we need to know the traceback
+      if (!sentryIgnoreTalismanHandlerError(error)) sentry.captureException(error)
+      safePostMessage(port, { id, error: error.message })
     })
     .finally(() => {
       // heap cleanup
@@ -136,4 +140,25 @@ const talismanHandler = <TMessageType extends MessageTypes>(
     })
 }
 
+/**
+ * If any of our handlers throw an error, we will (by default) log that error to sentry.
+ *
+ * However, there are some errors we expect to see during normal operation.
+ * These are errors which the frontend knows to look for and handle appropriately.
+ *
+ * For example, the error which is thrown when no accounts are authorised for a dapp.
+ *
+ * This function is used to distinguish between the errors which we don't expect to see,
+ * and the errors which we do expect to see - only the latter of which should be logged.
+ */
+const sentryIgnoreTalismanHandlerError = (error?: unknown): boolean => {
+  // ignore (don't log to sentry) these errors
+  if (error instanceof TalismanNotOnboardedError) return true
+  if (error instanceof SitesAuthorizedError) return true
+  if (error instanceof ChaindataChainNotFoundError) return true
+
+  // log all other errors
+  return false
+}
+
 export default talismanHandler