Error message in Debug

Hello,

We use your plugin and it works. However we keep get this messages in Debugger.
Is it possible to fix this problem?

Notice: Undefined index: text-8 in test.mijnwarmtepompadviseur.nl/wp-content/plugins/content-control/classes/Widget.php on line 45

Notice: Trying to access array offset on value of type null in test.mijnwarmtepompadviseur.nl/wp-content/plugins/content-control/classes/Site/Widgets.php on line 47

The page I need help with: [log in to see the link]