phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'df83d74a0fa042268249ae3d5d4ef293' 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 ('df83d74a0fa042268249ae3d5d4ef293', -1, 1419211593, 1419211593, 'adf538b1', 15, 0, 0)

Line : 245
File : sessions.php