diff --git a/cura/PlatformPhysics.py b/cura/PlatformPhysics.py
index 2a5bd4091c..4325703a37 100644
--- a/cura/PlatformPhysics.py
+++ b/cura/PlatformPhysics.py
@@ -102,7 +102,7 @@ class PlatformPhysics:
                         continue
                     
                     # Ignore collisions within a group
-                    if other_node.getParent().callDecoration("isGroup") is not None or node.getParent().callDecoration("isGroup") is not None:
+                    if other_node.getParent() and node.getParent() and (other_node.getParent().callDecoration("isGroup") is not None or node.getParent().callDecoration("isGroup") is not None):
                         continue
                     
                     # Ignore nodes that do not have the right properties set.