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 ('62a55c8f55b7e11ab25c8399a2db4a91', -1, 1709508668, 1709508668, '22cca9e6', 6, 0, 0)

Line : 187
File : sessions.php