string(246) "INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('1778b6a8417889f4af9cd0be97a769af', -1, 1429621880, 1429621880, '36a7ac7b', -10, 0, 0)" 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 ('1778b6a8417889f4af9cd0be97a769af', -1, 1429621880, 1429621880, '36a7ac7b', -10, 0, 0)

Line : 192
File : sessions.php