We can't see the whole line of your condition, so we'll be guessing a bit, but could you:
- remove the parameter from the .get call. The call is usually .get()?. Not sure there's any need to pass in a null
- Hover your cursor over the red x on the left. This should give you a yellow tooltip with an error message. It'll be in tech-speak but might explain it (don't hesitate to screenshot it and paste here if you can't work out what it's trying to say)
- Show us the whole condition (just copy/paste the text of it here, don't need it in pictures)
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