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 ('a6b8e0363ef7640fe70e2c3f65f6ab8c', -1, 1713951649, 1713951649, '12bc28cf', -4, 0, 0)

Line : 187
File : sessions.php