phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('a9d61e3f65e8f6e59335acffb693d0d6', -1, 1714617865, 1714617865, '12777d07', 14, 0)

Line : 158
File : sessions.php