I have a problem in my admin magento,
On system -> configuration -> advanced -> admin, the page goes to error 500.
I have activated the https certificate on the website. Maybe this is the problem, I don't know.
I have a screen of the error when i activated developer mode on the index.php : https://gyazo.com/74727cb8c3c84168a9bf1e3296127fc2
So maybe you could help me please.
Can you try disabling for a moment the module Nextend2?
It seems that there is some issue there.