diff --git a/x/opchild/keeper/msg_server.go b/x/opchild/keeper/msg_server.go
index d40e0e89..2dbfdf06 100644
--- a/x/opchild/keeper/msg_server.go
+++ b/x/opchild/keeper/msg_server.go
@@ -115,15 +115,12 @@ func (ms MsgServer) ExecuteMessages(ctx context.Context, req *types.MsgExecuteMe
 		var res *sdk.Result
 		res, err = handler(cacheCtx, msg)
 		if err != nil {
-			break
+			return nil, err
 		}
 
 		events = append(events, res.GetEvents()...)
-
-	}
-	if err != nil {
-		return nil, err
 	}
+
 	writeCache()
 
 	// TODO - merge events of MsgExecuteMessages itself
@@ -258,7 +255,6 @@ func (ms MsgServer) UpdateParams(ctx context.Context, req *types.MsgUpdateParams
 	}
 
 	return &types.MsgUpdateParamsResponse{}, nil
-
 }
 
 // SpendFeePool implements MsgServer interface.
diff --git a/x/opchild/keeper/msg_server_test.go b/x/opchild/keeper/msg_server_test.go
index f597a8c0..7ee29c26 100644
--- a/x/opchild/keeper/msg_server_test.go
+++ b/x/opchild/keeper/msg_server_test.go
@@ -58,6 +58,22 @@ func Test_MsgServer_ExecuteMessages(t *testing.T) {
 	require.NoError(t, err)
 	require.Len(t, vals, 1)
 	require.Equal(t, vals[0].Moniker, "val2")
+
+	// should failed with err (denom not sorted)
+	params := types.DefaultParams()
+	params.MinGasPrices = sdk.DecCoins{{
+		Denom:  "22222",
+		Amount: math.LegacyNewDec(1),
+	}, {
+		Denom:  "11111",
+		Amount: math.LegacyNewDec(2),
+	}}
+	updateParamsMsg := types.NewMsgUpdateParams(moduleAddr, &params)
+	msg, err = types.NewMsgExecuteMessages(addrsStr[0], []sdk.Msg{updateParamsMsg})
+	require.NoError(t, err)
+
+	_, err = ms.ExecuteMessages(ctx, msg)
+	require.Error(t, err)
 }
 
 /////////////////////////////////////////