Color changer mod - issue when doing an export

[sbulen]

As reported here:
https://www.simplemachines.org/community/index.php?msg=4122295

/var/www/html/forum/Sources/Class-ColorChanger.php (Line 264)
Type of error: Cron
Error messageSelect
8: Undefined index: theme_id

I've narrowed it down to when a user does an export of their profile.

If the option to include posts or PMs is not checked, it seems to just do it once. If they tick either of those options, it seems to do it repeatedly (maybe once per message?)

I've seen this also.