This recently started happening, and an asterisk restart will only temporarily fix the issue. It will eventually start reporting blank CDRs again.
*CLI> module show like mysql Module Description Use Count cdr_addon_mysql.so MySQL CDR Backend 0 app_addon_sql_mysql.so Simple Mysql Interface 0 res_config_mysql.so MySQL RealTime Configuration Driver 0
Please let me know if you require any additional information. I did some searching, and I found similar issues, but nothing EXACTLY like this (recurring failures).
Using version Asterisk 126.96.36.199