Handle Errors

Handle errors, manage fees, and dispose of sensitive data in gas-free Tron wallets.

This guide covers how to handle gas-free transfer errors and unsupported native transaction methods, plus best practices for fee management and memory cleanup.

Handle Gas-Free Transfer Errors

Gas-free transfers can fail for reasons including exceeded fee limits or insufficient token balances. Wrap calls to account.transfer() in try/catch blocks:

Gas-Free Transfer Error Handling

try {
  const result = await account.transfer({
    token: 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t', // USDT
    recipient: 'TLyqzVGLV1srkB7dToTAEqgDSfPtXRJZYH',
    amount: 1000000
  })
  console.log('Transfer successful:', result.hash)
  console.log('Fee paid:', result.fee, 'token units')
} catch (error) {
  console.error('Transfer failed:', error.message)
  if (error.message.includes('exceeds the transfer max fee')) {
    console.log('Transfer cancelled: fee too high')
  } else if (error.message.toLowerCase().includes('insufficient')) {
    console.log('Please add more TRC20 tokens to your wallet')
  }
}

Handle Unsupported Native Transaction Methods

The Tron GasFree module does not support native TRX transaction execution, native fee quotes, or offline transaction signing. The related methods are present for wallet-interface compatibility and throw module-specific errors:

Unsupported Native Transaction Methods

try {
  await account.sendTransaction({
    to: 'TLyqzVGLV1srkB7dToTAEqgDSfPtXRJZYH',
    value: 1000000
  })
} catch (error) {
  if (error.message.includes("Method 'sendTransaction(tx)' not supported")) {
    console.error('Use the base Tron wallet module for native TRX transactions.')
  }
}

Best Practices

Manage Fee Limits

Set transferMaxFee when creating the wallet or per-transfer to prevent gas-free transfers from exceeding a maximum cost. You can retrieve current network rates using wallet.getFeeRates():

Fee Management

const feeRates = await wallet.getFeeRates()
console.log('Normal fee rate:', feeRates.normal, 'sun')
console.log('Fast fee rate:', feeRates.fast, 'sun')

Dispose of Sensitive Data

Call dispose() on accounts and wallet managers to clear private keys and sensitive data from memory when they are no longer needed:

Memory Cleanup

account.dispose()

wallet.dispose()

Always call dispose() in a finally block or cleanup handler to ensure sensitive data is cleared even if an error occurs.