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Unable to update KNACK Record to blank field

  • February 2, 2026
  • 3 replies
  • 12 views

I need to clear the “Work Email” fields to blank.    When I try $$CLEAR$$, ___BLANK___, “   “,   , “” etc.

I get an email validation error.   I know it is possible to update via the API.  If I am unable to use the clear field, might need to code the API to clear the field.  Thank you.

Best answer by Troy Tessalone

Hi ​@TPAZ 

Unless the field tooltip explicitly indicates how to clear a field value with another specific value, you’d likely have to use the the app API to clear a field value.

3 replies

Troy Tessalone
Zapier Orchestrator & Solution Partner
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  • Zapier Orchestrator & Solution Partner
  • Answer
  • February 2, 2026

Hi ​@TPAZ 

Unless the field tooltip explicitly indicates how to clear a field value with another specific value, you’d likely have to use the the app API to clear a field value.


drtanvisachar
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  • Zapier Solution Partner
  • February 3, 2026

Hello ​@TPAZ  

This is expected behavior.

If the field is validated as an email, Update actions usually won’t accept empty values like CLEARCLEARCLEAR or blank strings. Leaving the field unmapped just means “don’t update,” not “clear.”

A couple quick things to check:
If the app has an overwrite or replace existing value option, enable that.
Try Utilities by Zapier Line-itemizer Create with nothing mapped. Some apps treat that as a true empty value.

If that still fails, Webhooks by Zapier with a Custom Request is the reliable route. Calling the app’s API directly lets you set the field to null or empty and bypasses Zapier’s validation.

If you’d like hands-on help or want us to walk through this live, you can book a 1:1 paid 60-minute strategy session with our team here:
👉 https://calendly.com/tuesdaywizard/1hourstrategy


  • Author
  • New
  • February 4, 2026

Thank you for your replies.  I will go the API route.  I just wanted to make sure there wasn’t some type of clearing variable, etc.