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 ('dd2d064e583c98f42c5e4da1a85cdd80', -1, 1545128808, 1545128808, '12d45dea', 1, 0, 0)

Line : 190
File : sessions.php