Internal Server Error 500

I’m having a weird problem that’s occurring only when updating homepage, I found what’s causing it but I don’t understand why! Very popular plugins like Jetpack, Hummingbird, Smush and Ninja Forms! When I disable them it seems to be working fine but after a while, the problem comes back and I will have to disable another plugin :/
I don’t get it and no one is really talking about it, is the problem from me?
I don’t have JS or PHP codes that are causing conflict because I didn’t add anything additional to the original code.
+ Why is it only happening when I try to update my homepage? All other pages work completely fine.

And reviewing my error_log I constantly get this:
PHP Warning: Invalid argument supplied for foreach() in public_html/wp-cron.php on line 117

Is this connected to my problem?

UPDATE: I fixed the problem, it was a memory size exhaustion and had nothing to do with these plugins. (Found the problem by debugging)

The fix was adding this line to wp-config.php:
define( ‘WP_MEMORY_LIMIT’, ‘256M’ );

• This topic was modified 5 years, 1 month ago by enaraborg.