phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO docttorrdiscluc_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('5f826167a1a92b9c7177e752cc18f9ed', -1, 1545132342, 1545132342, '12d45dea', -2, 0, 0)

Line : 190
File : sessions.php