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 ('83955aaf9faadaa8c25f43385cf4d0f2', -1, 1429610075, 1429610075, '321076df', 3, 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 ('83955aaf9faadaa8c25f43385cf4d0f2', -1, 1429610075, 1429610075, '321076df', 3, 0, 0)

Line : 192
File : sessions.php