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 ('401a0f6d8a179fb95b088648b15dd189', -1, 1542181887, 1542181887, '36dd4b73', 0, 0, 0)

Line : 190
File : sessions.php