diff --git a/src/python/jw/pkg/lib/App.py b/src/python/jw/pkg/lib/App.py
index 25faf496..ebd3fd6d 100644
--- a/src/python/jw/pkg/lib/App.py
+++ b/src/python/jw/pkg/lib/App.py
@@ -131,7 +131,7 @@ class App:  # export
             self.__default_log_file = env
 
         self.__back_trace = self._default_show_backtrace(False)
-        if (env := os.getenv(self._default_show_backtrace_env())) is not None:
+        if (env := os.getenv(self._default_show_backtrace_env(), None)) is not None:
             self.__back_trace = env.lower() in ['1', 'true']
 
         set_log_flags(self.__default_log_flags)