I’ve found a solution for me. A function from my functions.php file was in conflict with my filter admin.
I had to find where was my error, for that I just cut and paste my function one by one and test again and gain till I found my conflict function.
In my case I had to put my function in a conditional tag:
if(!is_admin()){
//Your conflict function
}
So Your function will be executed only on the theme and not in your admin.
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