diff --git a/plugins/PerObjectSettingsTool/PerObjectSettingVisibilityHandler.py b/plugins/PerObjectSettingsTool/PerObjectSettingVisibilityHandler.py
index e487870d8a..8eab144158 100644
--- a/plugins/PerObjectSettingsTool/PerObjectSettingVisibilityHandler.py
+++ b/plugins/PerObjectSettingsTool/PerObjectSettingVisibilityHandler.py
@@ -62,7 +62,7 @@ class PerObjectSettingVisibilityHandler(UM.Settings.Models.SettingVisibilityHand
                     if definition.global_inherits_stack and self._stack.getProperty("machine_extruder_count", "value") > 1:
                         #Obtain the value from the correct container stack. Only once, upon adding the setting.
                         stack_nr = self._stack.getProperty(item, "global_inherits_stack") #Stack to get the setting from.
-                        if float(stack_nr) >= 0: #Only if it defines an extruder stack.
+                        if stack_nr in ExtruderManager.getInstance().extruderIds: #Only if it defines an extruder stack.
                             extruder_stack = UM.Settings.ContainerRegistry.getInstance().findContainerStacks(id = ExtruderManager.getInstance().extruderIds[stack_nr])[0]
                             new_instance.setProperty("value", extruder_stack.getProperty(item, "value"))
                     settings.addInstance(new_instance)