phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('fe7ebc4238b6a177042b837f7b49df7d', -1, 1713542138, 1713542138, '12dd0f0f', 6, 0, 0)

Line : 187
File : sessions.php