phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '086daa0aa6bb61e9fe6ca958ff00408f' 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 ('086daa0aa6bb61e9fe6ca958ff00408f', -1, 1768819168, 1768819168, 'd849d879', -4, 0, 0)

Line : 187
File : sessions.php