XF 1.5 Blank page on load with date stamp

[PJK]

A user recently reported this:

Didn't want to create a new thread, but - conversations seems broken. When I post a reply, I just get a blank page with the date on it. It broke some time yesterday.

Another user too:

So totally weird thing with conversations. If you end a sentence with
data

the message fails, you get a grey screen
but only a smiley face after data when data is the last word
well, maybe there are other words / emotes that cause the error, but that one certainly does

I created a thread about a similar issue caused when I would modify stuff in the admin backend:
https://xenforo.com/community/threa...ppens-but-date-timestamp.129334/#post-1154089

Any ideas on how I should troubleshoot and resolve this?
Thanks.

 

[Amaury]

Have you tried disabling add-ons and seeing if that resolves the issue?

 

[PJK]

Have you tried disabling add-ons and seeing if that resolves the issue?

I can't seem to replicate the issues but they keep happening randomly so it's hard to tell what happens if I disable all plugins for a few minutes. I will disable addons when I can replicate. Can you recommend any way to press forward on this now? Thanks.

 

[PJK]

Have you tried disabling add-ons and seeing if that resolves the issue?

I've disabled all addons using $config['enableListeners'] = false; in config.php, and the issue still happens:
https://www.dropbox.com/s/9ji7h5ev4pz1diu/Screenshot 2017-08-09 17.10.46.png?dl=0

What can I do to troubleshoot this issue? Cheers!

 

[PJK]

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