phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6b7f157f410e8de9815bca66d5945f67' 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 ('6b7f157f410e8de9815bca66d5945f67', -1, 1770732932, 1770732932, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php