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 ('ec0c35f4ce3d22acc8b2cf0f38e1076f', -1, 1711711712, 1711711712, '03ede8c4', -8, 0, 0)

Line : 187
File : sessions.php