Application: undefined variable errors and can't delete created application

[bricklayer]

Trying to delete an application (running 1.8.3) that was created as a test but every time I try, I get the following error:


Details
ERROR: Cannot delete application
Undefined variable: host[/var/www/html/zabbix/include/hosts.inc.php:1446]
Undefined variable: app[/var/www/html/zabbix/include/hosts.inc.php:1446]
Application ":" used by item "Download speed for scenario 'Spectrum Home Prod'"

I've looked everywhere for the item referred to in the error but can't find it. If someone knows what to do please let me know.