diff --git a/src/Mod/CAM/Path/Base/Gui/PropertyBag.py b/src/Mod/CAM/Path/Base/Gui/PropertyBag.py
index f25b11e03a..aae8097e91 100644
--- a/src/Mod/CAM/Path/Base/Gui/PropertyBag.py
+++ b/src/Mod/CAM/Path/Base/Gui/PropertyBag.py
@@ -128,7 +128,10 @@ class PropertyCreate(object):
         self.form = FreeCADGui.PySideUic.loadUi(":panels/PropertyCreate.ui")
 
         obj.Proxy.refreshCustomPropertyGroups()
-        for g in sorted(obj.CustomPropertyGroups):
+        groups = obj.CustomPropertyGroups
+        if not isinstance(groups, (list, tuple)):
+            groups = [groups]
+        for g in sorted(groups):
             self.form.propertyGroup.addItem(g)
         if grp:
             self.form.propertyGroup.setCurrentText(grp)