Error log says:
!Script error
Thread: THRD-RUNVMI Dummy.handleEvent
Error: Thread::run: [illegal methodcall] null.currentPrice() type:L;
java.game.InventoryItem_Part:getPrice (line:92)
java.game.InventoryItem_Folder:getPrice (line:59)
java.game.CatalogInventory:update (line:2033)
java.game.Catalog:collectObjectsStep (line:361)
java.game.Catalog:collectObjectsEnd (line:266)
java.game.Catalog:osdCommand (line:1737)
java.render.osd.Gadget:sendMessage (line:211)
java.render.osd.Button:click (line:31)
java.render.Group:handleEvent (line:178)
Normally I can figure out what's wrong and can fix it myself but this ones got me stumpted