fix: undefined asset id in send page

closes #1703

Author: Nick-1979

packages/extension-polkagate/src/hooks/useBalances.ts

@@ -1,4 +1,4 @@
-// Copyright 2019-2024 @polkadot/extension-polkagate authors & contributors
+// Copyright 2019-2025 @polkadot/extension-polkagate authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
 import type React from 'react';
@@ -14,7 +14,7 @@ import { useBalancesOnAssethub, useBalancesOnMultiAssetChain, useInfo, useNative
 export default function useBalances (address: string | undefined, refresh?: boolean, setRefresh?: React.Dispatch<React.SetStateAction<boolean>>, onlyNew = false, assetId?: string | number): BalancesInfo | undefined {
   const { account, api, chainName, decimal: currentDecimal, genesisHash: chainGenesisHash, token: currentToken } = useInfo(address);
 
-  const isNativeAssetId = String(assetId) === String(NATIVE_TOKEN_ASSET_ID) || String(assetId) === String(NATIVE_TOKEN_ASSET_ID_ON_ASSETHUB);
+  const isNativeAssetId = String(assetId) === String(NATIVE_TOKEN_ASSET_ID) || String(assetId) === String(NATIVE_TOKEN_ASSET_ID_ON_ASSETHUB) || assetId === 'undefined';
   const maybeNonNativeAssetId = isNativeAssetId ? undefined : assetId;
 
   const balances = useNativeAssetBalances(address, refresh, setRefresh, onlyNew);