diff --git a/dapp/src/components/page/proposal/VotingModal.tsx b/dapp/src/components/page/proposal/VotingModal.tsx
index 588e57d..c1d966c 100644
--- a/dapp/src/components/page/proposal/VotingModal.tsx
+++ b/dapp/src/components/page/proposal/VotingModal.tsx
@@ -4,7 +4,7 @@ import type { VoteType } from "types/proposal";
 
 interface VotersModalProps {
   projectName: string;
-  proposalId: number;
+  proposalId: number | undefined;
   isVoted: boolean;
   setIsVoted: React.Dispatch<React.SetStateAction<boolean>>;
   onClose: () => void;
@@ -34,6 +34,10 @@ const VotingModal: React.FC<VotersModalProps> = ({
 
     setIsLoading(true);
     const { voteToProposal } = await import("@service/WriteContractService");
+    if (proposalId === undefined) {
+      alert("Proposal ID is required");
+      return;
+    }
     const res = await voteToProposal(projectName, proposalId, selectedOption);
 
     if (res.data) {
diff --git a/dapp/src/utils/store.js b/dapp/src/utils/store.js
index 691b26a..0942b97 100644
--- a/dapp/src/utils/store.js
+++ b/dapp/src/utils/store.js
@@ -4,5 +4,5 @@ export const projectInfoLoaded = atom(false);
 export const latestCommit = atom("");
 export const projectCardModalOpen = atom(false);
 export const projectNameForGovernance = atom("");
-export const proposalId = atom(0);
+export const proposalId = atom(undefined);
 export const connectedPublicKey = atom("");