phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'fc23a56752ace2054cb81829c5f15716' 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 ('fc23a56752ace2054cb81829c5f15716', -1, 1770003146, 1770003146, 'd849d837', -2, 0, 0)

Line : 187
File : sessions.php