1) Open up TV Series detection override menu
2) Right click on any existing rule
3) Select "Edit Override"

Receive following error:

I was able to replicate this but it was after adding new

if you don't have a number in both fields thetvdb and tvrage you get this error .

if you enter name Modern Family with no id's you get

invaildarguement=value of "1 is not valid for index."

If one field is left blank you get.

invaildarguement=value of "2 is not valid for index."
(tvrage id moves to tvdb on next relaunch when I left tvdb blank)
(click done and relaunch tv overide if you done get error on edit)

and if you don't remove the bad overide data it will replicate everytime you click on it and get the error.

Solution Both feilds has to have a id in it even if it is a 0.

You are right it does seem to be related to the fact that no ID is in one of the fields.

Still this should be corrected.

I didn't even enter the majority of these override detectors - they were automatically added by MCM. So MCM is creating overrides that you can't edit without crashing the program?

Seems silly to me.

Any chance this will be fixed soon?

Has this been added to the issue tracker?

If not can someone please add it, thanks.