phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f02b6c6edd17733eb4b0d6539111b1ff' 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 ('f02b6c6edd17733eb4b0d6539111b1ff', -1, 1770551358, 1770551358, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php