Fix push free. CURA-4525

1 files changed, 1 insertions, 1 deletions

diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index cc2074cc3e..5a57912db6 100755
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -80,7 +80,7 @@ class PlatformPhysics:
                 # Check for collisions between convex hulls
                 for other_node in BreadthFirstIterator(root):
                     # Ignore root, ourselves and anything that is not a normal SceneNode.
-                    if other_node is root or type(other_node) is not SceneNode or other_node is node:
+                    if other_node is root or not issubclass(type(other_node), SceneNode) or other_node is node:
                         continue
                     
                     # Ignore collisions of a group with it's own children