Can't execute query

insert into web_download_count 
                           set 
                                lang_type      = 'eng', 
                                file_id        = 132,
                                p_name         = 'PocketAutoCatch',
                                dc_id          = ,
                                dc_name        = 'Fighting Board',
                                IP_address     = '3.92.28.52',
                                user_device    = 0,
                                user_info      = 'CCBot/2.0 (https://commoncrawl.org/faq/)',
                                o_name         = 'PocketAutoCatch_說明書_20170728_日only.pdf',
                                ser_name       = '1708012096.pdf',
                                sport          = 0,
                                version        = '',
                                download_type  = 1,
                                download_time  = '2021-12-02 21:23:46'

MySQL Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ' dc_name = 'Fighting Board', ' at line 6

This script cannot continue, terminating.