phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8fabf19a1ef5313abac75be24bed0a25' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('8fabf19a1ef5313abac75be24bed0a25', -1, 1490611159, 1490611159, '36a618b5', -1, 0, 0)

Line : 187
File : sessions.php