phpBB : Critical Error

Error creating new sessions

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b147cb4bd2fab416d5e215e2c81bac6b' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b147cb4bd2fab416d5e215e2c81bac6b', -1, 1513449262, 1513449262, '3652519a', 1, 0, 0)

Line : 187
File : sessions.php