phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4225655badd4cd197fb33724c010431a' 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 ('4225655badd4cd197fb33724c010431a', -1, 1422548477, 1422548477, '36eae117', 15, 0, 0)

Line : 245
File : sessions.php