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 ('7919301ce66d29dfbd3e9a2b2f9b4b61', -1, 1711678455, 1711678455, '2ccc1852', -10, 0, 0)

Line : 187
File : sessions.php