diff --git a/ui/properties.py b/ui/properties.py
index 414a93a..ec4e457 100644
--- a/ui/properties.py
+++ b/ui/properties.py
@@ -501,7 +501,10 @@ class VSETB_PGT_strip_settings(PropertyGroup):
 
     @property
     def active_casting(self):
-        return self.casting[self.casting_index]
+        try:
+            self.casting[self.casting_index]
+        except KeyError:
+            return
 
 classes = (
     Asset,