phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '12b8c9e92ff32b4f17c403f433764158' 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 ('12b8c9e92ff32b4f17c403f433764158', -1, 1764619562, 1764619562, 'd849d825', -4, 0, 0)

Line : 187
File : sessions.php