--- powerline/__init__.py	2023-04-15 21:49:32.982012186 +0200
+++ powerline/__init__.py	2023-04-15 21:46:49.680958336 +0200
@@ -252,7 +252,7 @@
 		except IndexError:
 			handler_format = common_config['log_format']
 		handler.setLevel(getattr(logging, handler_level_name))
-		handler.setFormatter(logging.Formatter(handler_format))
+		handler.setFormatter(logging.Formatter(handler_format, validate=False))
 		logger.addHandler(handler)
 		num_handlers += 1
 	if num_handlers == 0 and log_targets: