I have Discovery with id, for example = 1
In Monitoring->Discovery all was ok, but after deleting it in Configuration->Discovery (second tab in my browser).
I have errors in my first tab (Monitoring->Discovery)

Undefined offset: 1 [include\views\monitoring.discovery.php:74]
reset() expects parameter 1 to be array, null given [include\views\monitoring.discovery.php:78]
Array to string conversion [include\views\monitoring.discovery.php:123]

link: discovery.php?sid=f14760ea9744640f&fullscreen=0&druleid=1