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 ('774db7eb5840db17ab4fe34c9b6c1c81', -1, 1711709291, 1711709291, '12cc231e', 0, 0, 0)

Line : 187
File : sessions.php