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 ('6e9d919bc048b1daef0fd05d3f28b08f', -1, 1711721708, 1711721708, '36c47276', -2, 0, 0)

Line : 187
File : sessions.php