Fix to prevent crash when adjusting cell-count pixel/um ratio without…

… loading an image first. (#263)
EtalumaSupport · Sep 6, 2023 · e8bef95 · e8bef95
1 parent 7326e4a
commit e8bef95
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/lumaviewpro.py b/lumaviewpro.py
@@ -603,6 +603,7 @@ def __init__(self, **kwargs):
         super().__init__(**kwargs)
         logger.info('LVP Main: CellCountPopup.__init__()')
         self._preview_source_image = None
+        self._preview_image = None
         self._post = None
         self._post = post_processing.PostProcessing()
         self._settings = self._get_init_settings()
@@ -851,6 +852,9 @@ def _validate(value_str):
         if not valid:
             return
 
+        if self._preview_image is None:
+            return
+
         self._settings['context']['pixels_per_um'] = value
         self.update_filter_max(image=self._preview_image)