phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO forum_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f3d2e71aff60c6e0d7fa0d0294000753', -1, 1540158866, 1540158866, '3691534f', 10, 0, 0)

Line : 187
File : sessions.php