phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4b5c2fb4a09bb70f741a093e3043f988' for key 1

INSERT INTO sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4b5c2fb4a09bb70f741a093e3043f988', -1, 1228206932, 1228206932, '26673f3c', 8, 0, 0)

Line : 187
File : sessions.php