phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '9b70ad7b38f5076e7df1deab56faaa09' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('9b70ad7b38f5076e7df1deab56faaa09', -1, 1766628763, 1766628763, 'd849d82e', -4, 0, 0)

Line : 187
File : sessions.php