phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'fb9304f0c147f8dc333abec59cf075dc' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('fb9304f0c147f8dc333abec59cf075dc', -1, 1430167424, 1430167424, 'b849036b', -9, 0, 0)

Line : 187
File : sessions.php