mypy fix

mantidproject · Aug 23, 2024 · 486da42 · 486da42
1 parent dee5ab4
commit 486da42
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/mantidimaging/gui/windows/live_viewer/model.py b/mantidimaging/gui/windows/live_viewer/model.py
@@ -136,7 +136,8 @@ def add_images_to_delayed_stack(self, new_image_list: list[Image_Data], param_to
             self.add_last_mean()
 
     def add_last_mean(self) -> None:
-        self.mean.append(dask.array.mean(self.delayed_stack[-1]).compute())
+        if self.delayed_stack is not None:
+            self.mean.append(dask.array.mean(self.delayed_stack[-1]).compute())
 
     def delete_all_data(self):
         self.image_list = []