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 ('2eb32706f35f4306ac5f330d2b174f2b', -1, 1711673811, 1711673811, '36add64f', 3, 0, 0)

Line : 187
File : sessions.php