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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 ('92625fc5caafec0e887f0e9f65116352', -1, 1408566312, 1408566312, 'ccecff45', 3, 0, 0)

Line : 187
File : sessions.php