phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1a420cb6a458497e998195382522b3a' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b1a420cb6a458497e998195382522b3a', -1, 1409203085, 1409203085, '3650133f', 58, 0, 0)

Line : 187
File : sessions.php