diff --git a/src/Mod/Arch/ArchSchedule.py b/src/Mod/Arch/ArchSchedule.py
index 938c7e3f56..a4e1e66aa6 100644
--- a/src/Mod/Arch/ArchSchedule.py
+++ b/src/Mod/Arch/ArchSchedule.py
@@ -127,6 +127,7 @@ class _ArchSchedule:
                 if objs:
                     objs = objs.split(";")
                     objs = [FreeCAD.ActiveDocument.getObject(o) for o in objs]
+                    objs = [obj for obj in objs if obj != None]
                 else:
                     objs = FreeCAD.ActiveDocument.Objects
                 if len(objs) == 1: