phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO iabb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c6b9ec55f0947dc2048fdc94b843ae43', -1, 1560895099, 1560895099, '035482fc', 60, 0, 0)

Line : 187
File : sessions.php