phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '46f941c9bd16b2e3cafd3399491c6c8e' 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 ('46f941c9bd16b2e3cafd3399491c6c8e', -1, 1484718652, 1484718652, '17172574', -1, 0, 0)

Line : 187
File : sessions.php