phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c7ff9be71be0f036dc9397d9a662a975' 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 ('c7ff9be71be0f036dc9397d9a662a975', -1, 1769547312, 1769547312, 'd849d8d0', -4, 0, 0)

Line : 187
File : sessions.php