string(244) "INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('08ff2b149a9b49e110425e5104df4f6b', -1, 1429604917, 1429604917, '3691b3ce', 2, 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 ('08ff2b149a9b49e110425e5104df4f6b', -1, 1429604917, 1429604917, '3691b3ce', 2, 0, 0)

Line : 192
File : sessions.php