phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '15e6f40c2124ebfb67301c317c5c8f78' 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 ('15e6f40c2124ebfb67301c317c5c8f78', -1, 1769941338, 1769941338, 'd849d822', -4, 0, 0)

Line : 187
File : sessions.php