phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c8b637b3da455a2de07100088b14d2e7' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c8b637b3da455a2de07100088b14d2e7', -1, 1767109916, 1767109916, 'd849d819', -9, 0, 0)

Line : 187
File : sessions.php