phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO oka_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('de884cedecf613bb1ab71f766c73f6c7', -1, 1548260309, 1548260309, '03502021', 1, 0)

Line : 184
File : /home/c128/public_html/talk/includes/sessions.php