phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '3c87698ec2358f2383cd153fdf4d7bf8' 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 ('3c87698ec2358f2383cd153fdf4d7bf8', -1, 1537830041, 1537830041, '36c6670d', 9, 0, 0)

Line : 198
File : sessions.php