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 ('b748eebf7941d58e7fe17bced3a69540', -1, 1545128819, 1545128819, '12d45dea', -4, 0, 0)

Line : 190
File : sessions.php