woocommerce: Fatal error: Allowed memory size

hello everyone, I have a problem with woocommerce, when I go to the modification of a product, you get the blank page.

By enabling debugging I discovered that reminds me of this error:
Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 92 bytes)

I increased the memory which already was at 128M to 1024M is that of php.ini to wp-config.php, but the problem persists.

I do not know what to do … someone can help ??

thank you
max