diff --git a/ui/properties.py b/ui/properties.py
index ec4e457..86ab499 100644
--- a/ui/properties.py
+++ b/ui/properties.py
@@ -503,7 +503,7 @@ class VSETB_PGT_strip_settings(PropertyGroup):
     def active_casting(self):
         try:
             self.casting[self.casting_index]
-        except KeyError:
+        except IndexError:
             return
 
 classes = (