Okay, so StreamHandler is not in logging.handlers like the other handlers.

tekstmelding.py

@@ -15,14 +15,14 @@ app = Flask(__name__)
 app.config.from_object('config')
 app.json_encoder = CustomJSONEncoder
 
-# if not app.debug:
-#     import logging
-#     from logging.handlers import StreamHandler
-#     handler = StreamHandler(stream=sys.stderr)
-#     formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
-#     handler.setFormatter(formatter)
-#     handler.setLevel(logging.INFO)
-#     app.logger.addHandler(handler)
+if not app.debug:
+	import logging
+	from logging import StreamHandler
+	handler = StreamHandler(stream=sys.stderr)
+	formatter = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")
+	handler.setFormatter(formatter)
+	handler.setLevel(logging.INFO)
+	app.logger.addHandler(handler)
 
 def connect_db():
 	"""Connects to our database."""