diff --git a/x/committer/keeper/msg_server.go b/x/committer/keeper/msg_server.go
index a664cc8dc0..cfd9ae76f3 100644
--- a/x/committer/keeper/msg_server.go
+++ b/x/committer/keeper/msg_server.go
@@ -44,10 +44,13 @@ func (k msgServer) SubmitProof(goCtx context.Context, msg *types.MsgSubmitProof)
 			Status:        types.VotingStatus,
 		}
 
-		if lastProposal.EndIndex+1 != proposal.StartIndex {
+		if !(lastProposal.EndIndex == 0 && proposal.StartIndex == 1) &&
+			!(lastProposal.EndIndex != 0 && lastProposal.EndIndex == proposal.StartIndex) {
 			return &types.MsgSubmitProofResponse{},
 				fmt.Errorf(
-					"proposal start index must equal last proposal end index + 1, "+
+					"if last proposal end index is 0, then proposal start index must be 1, "+
+						" else if last proposal end index is not 0, then proposal start"+
+						" index must equal last proposal end index, "+
 						"last proposal end index: %s", fmt.Sprint(lastProposal.EndIndex))
 		}
 
diff --git a/x/committer/keeper/msg_server_test.go b/x/committer/keeper/msg_server_test.go
index fae5292fe4..b6fe0a05ca 100644
--- a/x/committer/keeper/msg_server_test.go
+++ b/x/committer/keeper/msg_server_test.go
@@ -62,7 +62,7 @@ func TestSubmitProof(t *testing.T) {
 				EndIndex:   11,
 			},
 			isError: true,
-			errMsg:  "proposal start index must equal last proposal end index + 1",
+			errMsg:  "proposal start index must equal last proposal end index",
 			preRun: func(ctx sdk.Context, k keeper.Keeper) {
 				k.SetLastProposal(ctx, types.Proposal{
 					Id:         1,