phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a9cdcf1555a4f3b475fd342ee7701d0c' 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 ('a9cdcf1555a4f3b475fd342ee7701d0c', -1, 1765867530, 1765867530, 'd849d850', -9, 0, 0)

Line : 187
File : sessions.php