Guests cannot able to log in on my site!

[louzhiming]

Hi,

@yash7690 

My situation is mainly that only a few users can't log in, not all users.

thank you very much!

[ecommerce_xpert]

There could be many reason for the  reported concern zend_mm_heap corrupted. The most probable could be:

1. PHP OpCache Issue - Disable it and check whether you still have this issue or not

2. PHP Output Buffering is Low - Increase PHP Output Buffering to get rid of this problem 

3. Buggy extension which is crashing PHP - Most time consuming activity to find out the culprit as you need to disable all third-party PHP extensions one after the another until you identify which one is causing the problem

Let us know if you still have the issue.

[yash7690]

Hi @louzhiming ,

I understand, i faced the same issue with one of my client. It was due to he was using an extension that fires bulk emails on some events. That extension was not causing trouble for all the users, but only for those users, whose email ids were wrong/non-existent. That was for my case. Check if you have trouble only with non-existent/wrong email addresses and if it works fine for right/existent email addresses.