diff --git a/kitty/boss.py b/kitty/boss.py
index 60cc54bc6..a47157ebb 100644
--- a/kitty/boss.py
+++ b/kitty/boss.py
@@ -1454,7 +1454,7 @@ class Boss:
         source_window: Window,
         default_data: Optional[Dict[str, Any]] = None
     ) -> None:
-        data = getattr(source_window, 'kitten_result', None)
+        data, source_window.kitten_result = source_window.kitten_result, None
         if data is None:
             data = default_data
         if data is not None:
diff --git a/kitty/window.py b/kitty/window.py
index bef74bdd8..971ba974c 100644
--- a/kitty/window.py
+++ b/kitty/window.py
@@ -455,6 +455,7 @@ class Window:
         self.id: int = add_window(tab.os_window_id, tab.id, self.title)
         self.margin = EdgeWidths()
         self.padding = EdgeWidths()
+        self.kitten_result: Optional[Dict[str, Any]] = None
         if not self.id:
             raise Exception(f'No tab with id: {tab.id} in OS Window: {tab.os_window_id} was found, or the window counter wrapped')
         self.tab_id = tab.id
@@ -938,7 +939,7 @@ class Window:
 
     def handle_kitten_result(self, msg: str) -> None:
         import base64
-        self.kitten_result: Dict[str, Any] = json.loads(base64.b85decode(msg))
+        self.kitten_result = json.loads(base64.b85decode(msg))
 
     def handle_overlay_ready(self, msg: str) -> None:
         boss = get_boss()