WP-Debug true brings up some errors

Hi

I was just testing with wp-debug set to true and an error relating to this plugin came up:

Undefined index: user… lite-cache/plugin.php on line 65
just thought I better say incase it’s something important.

Also noticed
Use of undefined constant SID – assumed ‘SID … advanced-cache.php on line 5

Cannot modify header information – headers already sent by advanced-cache.php:5 (when using bad behaviour plugin)

https://www.ads-software.com/extend/plugins/lite-cache/