phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ad6a394d216c1c1bce806d8728b3a214' 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 ('ad6a394d216c1c1bce806d8728b3a214', -1, 1767307722, 1767307722, 'd849d819', -9, 0, 0)

Line : 187
File : sessions.php