Welcome to the forum @grasgruen.it
What version of nodejs are you using? (node -v will tell you).
Check in Manage Palette that you are using the latest versions of all nodes.
Create a short flow showing the problem (preferably something like an Inject node and your grabber node), export it and paste it here. When posting flows it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
See this post for more details - How to share code or flow json
