Prevent a crash when cut pasting a factory

Author: Quezler

mods/factoryplanner-is-exportable-to-fake-factorissimo/info.json

@@ -2,7 +2,7 @@
     "name": "factoryplanner-is-exportable-to-fake-factorissimo",
     "title": "Factory Planner - exportable to fake factorissimo",
     "description": "Skips the building stage, just feed items into the magic box.",
-    "version": "1.0.9",
+    "version": "1.0.10",
     "author": "Quezler",
     "factorio_version": "1.1",
     "dependencies": [

mods/factoryplanner-is-exportable-to-fake-factorissimo/scripts/factory.lua

@@ -70,6 +70,7 @@ function Factory.on_created_entity(event)
         goto clipboard_copied_from_source_struct
       end
     end
+    return
   end
 
   if event.robot then