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 ('c29f3e21be4b5e26250033d947f3af44', -1, 1711642483, 1711642483, '035083a4', 0, 0, 0)

Line : 187
File : sessions.php