"error: variable handler is already defined" when using multiple protocols

Arguments:

        '--logReads',
        '--logWrites',
        '--rootNode=Root',
        '--experimental-jastadd-329',
        '--incremental=param',
        '--tracing=cache,flush',
        '--List=JastAddList',
        '--protocols=mqtt,java'

Error:

error: variable handler is already defined in method connectGetStateAsString(String,boolean)
      final MqttHandler handler = _ragconnect_mqttHandler().resolveHandler(uri);
                        ^