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 ('a4f9a79cf6be27c451217035c1731560', -1, 1711711329, 1711711329, '2cc831c1', -9, 0, 0)

Line : 187
File : sessions.php