phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5a12dff121ef0dd9a04c7b4970cd1dc0' 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 ('5a12dff121ef0dd9a04c7b4970cd1dc0', -1, 1772647268, 1772647268, 'd849d831', -4, 0, 0)

Line : 215
File : sessions.php