phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ca9d646e8d04cb7613d7a5dd49326015' 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 ('ca9d646e8d04cb7613d7a5dd49326015', -1, 1770026101, 1770026101, 'd849d817', -4, 0, 0)

Line : 187
File : sessions.php