phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6e695d646dee56a22f5c00b7664b23c0' 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 ('6e695d646dee56a22f5c00b7664b23c0', -1, 1495892855, 1495892855, '3650104b', -8, 0, 0)

Line : 187
File : sessions.php