Just for a specific customer every time when I tried to modify some Personal Information in the backend(customer section), or if I tried with the same user to access the cart or the checkout page, I receive this error in the browser: ERR_EMPTY_RESPONSE.

In var/log folder I don't have anything related to this issue.

What is really weird is the fact that only for one user this is happening, and unfortunately, i can't delete this user because there are many orders related with.

If i tried to do the same operations with other users everything goes fine.

What i found related to my issue is to try flushing the APC Opcode cache by using:


But when i tried to do this i receive "undefined method" error which means that i don't have PHP APC extension enabled.

Does anyone know what i should do to solve this err?

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