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 ('f365da9cd659f460ee83987c8da0f64f', -1, 1711634917, 1711634917, '035d3bab', -7, 0, 0)

Line : 187
File : sessions.php