diff --git a/lib/extensions/base.py b/lib/extensions/base.py
index 49c9687e7..3c16a11c9 100644
--- a/lib/extensions/base.py
+++ b/lib/extensions/base.py
@@ -89,7 +89,7 @@ class InkstitchExtension(inkex.EffectExtension):
             return []
 
         if self.svg.selection:
-            if node in self.svg.selection:
+            if node in list(self.svg.selection):
                 selected = True
         else:
             # if the user didn't select anything that means we process everything