Index: lt8900_spi/__init__.py
==================================================================
--- lt8900_spi/__init__.py
+++ lt8900_spi/__init__.py
@@ -231,11 +231,11 @@
 
 	def __del__(self):
 		self._spi.close()
 
 	def _debug(self, message):
-		if 'debug_log_command' in self._config:
+		if self._config is not None and 'debug_log_command' in self._config:
 			self._config['debug_log_command'](message)
 		return None
 
 	def _reset_device(self):
 		if self._config is not None: