500 error when image upload with Laravel 5.8 on nginx server

I'm getting 500 internal error when i try to upload 20kb image file.

I was checked following steps for finding to solution but it doesn't work :

• I have hidden input for csrf token
• I checked my storage and bootstrap folder for chmod 755 but they have permission.
• My public folder has 777 permission
• When i change app_env=local and app_debug=true there is no diffrent error.
• There is no error log in storage/logs
• When i try to submit form without image it worked.
• there is no specific error in nginx logs (var/log/nginx/error.log)

I'm trying to upload image with laravel form in nginx server but i get 500 internal server error.

via Chebli Mohamed