phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8ca907de8b62b78ad616ed60ee8e9aac' 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 ('8ca907de8b62b78ad616ed60ee8e9aac', -1, 1768183195, 1768183195, 'd849d8a2', -2, 0, 0)

Line : 187
File : sessions.php