XF 1.5 HTTP ERROR 500 Bug Only On Some Threads?!?!

[SamG]

Hey guys so on my forum i sometimes come some threads which will display this error....

This page isn’t working

mydomain.com is currently unable to handle this request.
HTTP ERROR 500

But yet if i view the thread as a guest it loads fine i'm really struggling to figure out the issue could someone maybe help me out here?

Thanks,
Sam

 

[SamG]

Update:

I disabled all my addons in the listener and now its working i guess i will have to just find the conflicting addon