Fatal error: MySQL error.

Query:
INSERT INTO pmd_error_log (date,code,message,file,line,trace) VALUES (NOW(),256,'MySQL error.\n\nQuery:\nSELECT session_data FROM pmd_sessions WHERE id='927be2dbc758fa72da317a4ee0d5a977' AND http_user_agent='f9951aabe495e27a7ac39a16edf63e10' AND last_access > 1371683225\n\nError:\n (145) Table \'./glasgow_pmd/pmd_sessions\' is marked as crashed and should be repaired\n\n','/home/glasgow/domains/glasgowlocal.net/public_html/includes/class_database.php',130,'a:8:{i:0;a:6:{s:4:\"file\";s:78:\"/home/glasgow/domains/glasgowlocal.net/public_html/includes/class_database.php\";s:4:\"line\";i:199;s:8:\"function\";s:5:\"Query\";s:5:\"class\";s:8:\"Database\";s:4:\"type\";s:2:\"->\";s:6:\"object\";O:8:\"Database\":6:{s:10:\"connection\";i:0;s:5:\"debug\";b:0;s:10: in /home/glasgow/domains/glasgowlocal.net/public_html/includes/class_database.php on line 130