diff --git a/statapp/main_window.py b/statapp/main_window.py
index 7c41c94..eda4124 100644
--- a/statapp/main_window.py
+++ b/statapp/main_window.py
@@ -6,8 +6,6 @@ from statapp.ui.ui_main_window import Ui_MainWindow
 
 
 class MainWindow(QMainWindow):
-    about_window = None
-
     def __init__(self):
         super().__init__()
         self.ui = Ui_MainWindow()