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After transferring website - PHP Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 32768 bytes) [duplicate]

I am transferring website from one host to another. A very strange error occurred that I haven't seen before.

PHP Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 32768 bytes)

I thought that this was a wp memory limit issue so I added this to my wp-config.php file

define( 'WP_MEMORY_LIMIT', '8096M' );
define( 'WP_MAX_MEMORY_LIMIT', '8096M' );
But the website keeps returning error 500, and this error in my error log.
Anyone any ideas?
                Find the code that's causing the error. The error should at least give you the script that's causing it.
– aynber
                Sep 14, 2018 at 13:43
                I found it but no help, i tried deleting it, then it pointed me to another part of code so i can't delete the whole wp-core-functions of woocommerce. The problem must be elsewhere. @aynber
– Милен Чавдаров
                Sep 14, 2018 at 13:44
                @aynber Hitting the memory limit isn't always the fault of the code that finally hits the limit - it can be a "straw that broke the camel's back" scenario. 40 MB is a very low memory limit, particularly for something memory-heavy like WP.
– ceejayoz
                Sep 14, 2018 at 14:00
In Wordpress PHP file(s) :
Try to add ini_set('memory_limit', '1024M'); on pages that causes the error (or in a PHP file included on all pages)
In php.ini : Search the php.ini file read by your PHP server and try to increase the memory_limit parameter (never set this key at -1 because it can freeze the server if you (really) have a problem in your code).