diff --git a/src/pyside6/gui_pyside6.py b/src/pyside6/gui_pyside6.py
index a09881f..f0047c9 100644
--- a/src/pyside6/gui_pyside6.py
+++ b/src/pyside6/gui_pyside6.py
@@ -41,11 +41,14 @@ class MainWindow(QMainWindow):
             self.hide()
 
     def del_tab(self, index: int):
-        self.trades[self.main_widget.widget(index).unique_item].deleteLater()
-        del self.trades[self.main_widget.widget(index).unique_item]
+        collection = self.main_widget.widget(index)
+        assert isinstance(collection, TradeCollection)
+        self.trades[collection.unique_item].deleteLater()
+        del self.trades[collection.unique_item]
         if not self.trades:
             self.hide()
 
+
 if __name__ == "__main__":
     conf = config.read_config(r'config.yaml')
     compile_regex(conf)
@@ -53,7 +56,8 @@ if __name__ == "__main__":
         'listed for 18 chaos in Ritual (stash tab "$"; position: left 22, top 5)'
     text2 = '2021/03/08 23:24:52 17931875 bb3 [INFO Client 1492] @From NiceGuy: Hi, I would like to buy your level 21 23% Vaal Impurity of Lightning ' \
         'listed for 18 chaos in Ritual (stash tab "$"; position: left 22, top 5)'
-    text3 = '2023/01/02 23:57:26 15123437 cffb0734 [INFO Client 16668] @From <SETSU?> LASTTRYPOEenjoyer: Hi, I would like to buy your Watcher\'s Eye, Prismatic Jewel listed for 2.5 divine in Sanctum (stash tab "$2"; position: left 8, top 7)'
+    text3 = '2023/01/02 23:57:26 15123437 cffb0734 [INFO Client 16668] @From <SETSU?> LASTTRYPOEenjoyer: ' \
+        'Hi, I would like to buy your Watcher\'s Eye, Prismatic Jewel listed for 2.5 divine in Sanctum (stash tab "$2"; position: left 8, top 7)'
     message = Message.from_text(text)
     message2 = Message.from_text(text2)
     message3 = Message.from_text(text3)
@@ -61,6 +65,9 @@ if __name__ == "__main__":
     app.setStyle('Material')
 
     window = MainWindow()
+    assert message
+    assert message2
+    assert message3
     window.new_trade(message)
     window.new_trade(message)
     window.new_trade(message2)