The attribute has more than 200 options. Is maybe the high number of the options causing this problem?

The nginx error log below

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2018/01/22 14:21:23 [error] 4034#0: *335424 FastCGI sent in stderr: "PHP message: PHP Warning:  Unknown: Input variables exceeded 1000. 
To increase the limit change max_input_vars in php.ini. in Unknown on line 0" while reading response header from upstream

Solution:

1.change the php.ini config of max_input_vars = 1000 to max_input_vars = 5000

2.restart or reload the php-fpm. then have a try.