Intermittent error during scanning - Could not decode (...)

[larsyngvelundin]

Intermittently when trying to get the symbol from ERC20 contracts, we get these errors:

Traceback (most recent call last):
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\web3\contract\utils.py", line 111, in call_contract_function
    output_data = w3.codec.decode(output_types, return_data)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\codec.py", line 145, in decode
    return decoder(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 129, in __call__
    return self.decode(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_utils\functional.py", line 45, in inner
    return callback(fn(*args, **kwargs))
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 175, in decode
    yield decoder(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 129, in __call__
    return self.decode(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 144, in decode
    start_pos = decode_uint_256(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 129, in __call__
    return self.decode(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 199, in decode
    raw_data = self.read_data_from_stream(stream)
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\eth_abi\decoding.py", line 306, in read_data_from_stream
    raise InsufficientDataBytes(
eth_abi.exceptions.InsufficientDataBytes: Tried to read 32 bytes.  Only got 0 bytes

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\nok13\Documents\GitHub\WAGMI\main.py", line 100, in <module>
    start_scanner()
  File "C:\Users\nok13\Documents\GitHub\WAGMI\main.py", line 37, in start_scanner
    scanner.start()
  File "C:\Users\nok13\Documents\GitHub\WAGMI\modules\scanner\scanner_main.py", line 75, in start
    token2_symbol = token2.functions.symbol().call()
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\web3\contract\contract.py", line 461, in call
    return call_contract_function(
  File "C:\Users\nok13\Documents\GitHub\WAGMI\venv\lib\site-packages\web3\contract\utils.py", line 129, in call_contract_function
    raise BadFunctionCallOutput(msg) from e
web3.exceptions.BadFunctionCallOutput: Could not decode contract function call to symbol with return data: b'', output_types: ['string']

Function where it originates in our code seems to be token2.functions.symbol().call(), line 75, in scanner_main.py