# Baserow Error when empty fields in prefill form URL

**URL:** https://community.baserow.io/t/baserow-error-when-empty-fields-in-prefill-form-url/12230
**Category:** Feedback
**Created:** [March 26, 2026, 6:04pm UTC](https://community.baserow.io/t/baserow-error-when-empty-fields-in-prefill-form-url/12230 "2026-03-26T18:04:48Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![asan](https://community.baserow.io/user_avatar/community.baserow.io/asan/32/2108_2.png) [@asan](https://community.baserow.io/u/asan)
#### Post date: [March 26, 2026, 6:04pm UTC](https://community.baserow.io/t/baserow-error-when-empty-fields-in-prefill-form-url/12230/1 "2026-03-26T18:04:49Z")

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Hi Baserow team,

When I built a prefilled form URL, Baserow returns an error `Cannot read properties of undefined (reading ‘multiple_select_default’)` when fields are prefilled with empty values like `&prefill_FieldName=&prefill...`. It seems to occur for (at least) link to table and multiple select fields.

Am I doing something wrong? Is this a bug?

I don’t exactly know when this appeared but I think it’s quite recent. May be a regression in a recent version?

Thanks,

asan 🦊

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### Author: ![davide](https://community.baserow.io/user_avatar/community.baserow.io/davide/32/2425_2.png) [@davide](https://community.baserow.io/u/davide)
#### Post date: [March 30, 2026, 4:39pm UTC](https://community.baserow.io/t/baserow-error-when-empty-fields-in-prefill-form-url/12230/2 "2026-03-30T16:39:43Z")

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Hey @asan,

can you provide us some steps to reproduce it?  
I tried creating a form with different field types and prefill combinations of both empty and non empty fields but I cannot replicate it.