Error when deleting NPC from CT

hello, im running the 4e ruleset with no extensions. When I delete something from the combat tracker, whether from a module or something I made up there is an error.
"Script execution error: [string "ct/scripts/ct_entry.lua"]:104: attempt to index global 'windowlist' (a nil value)" any idea why this happens or how to fix it?

Edit: This actually happens if I delete a PC as well.

That line is different in the current Live version of the 4E code. Please make sure that you do not have any subfolders under your rulesets folder in the FG data folder.

Regards,
JPG

I didn't but I deleted the 4e.pak and updated and it went away. Must have had an old version installed while setting up things for a 4e game. Thanks Moon!