diff --git a/src/qt_owner.py b/src/qt_owner.py
index 9ef64c0..2341313 100644
--- a/src/qt_owner.py
+++ b/src/qt_owner.py
@@ -44,7 +44,7 @@ def SetSubTitle(self, text):
     
     def ShowError(self, msg):
         if isinstance(msg, dict):
-            if "errorMsg" in msg:
+            if msg.get('errorMsg'):
                 return MsgLabel.ShowErrorEx(self.owner, str(msg["errorMsg"]))
             else:
                 return MsgLabel.ShowErrorEx(self.owner, Str.GetStr((msg.get("st"))))