phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '15700c7bf76e2d16001eded6771f3183' 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 ('15700c7bf76e2d16001eded6771f3183', -1, 1765402667, 1765402667, 'd849d8da', -4, 0, 0)

Line : 187
File : sessions.php