Can't execute query

insert into web_download_count 
                           set 
                                lang_type      = 'tw', 
                                file_id        = 115,
                                p_name         = 'Mars Wired Controller　',
                                dc_id          = ,
                                dc_name        = 'Mars',
                                IP_address     = '18.118.145.114',
                                user_device    = 0,
                                user_info      = 'Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)',
                                o_name         = 'BrookMarsWiredController_Online(20220816).zip',
                                ser_name       = '2208232178.zip',
                                sport          = 0,
                                version        = 'v1.6',
                                download_type  = 2,
                                download_time  = '2024-04-20 05:47:20'

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 = 'Mars', ' at line 6

This script cannot continue, terminating.