Last updated:

May 19, 2026

Why is my Category Filter not Working?

Two causes for a broken category filter: (1) Out of Sync — filter chips don't match your CMS option values after a change. Fix by editing the filter in Dynamic Map App to add missing chips, then click Insert Code. (2) Empty Option Fields — if any CMS item has an empty option field, the whole filter breaks. Fix by creating a placeholder option called empty, assigning it to uncategorised items, and hiding the chip in Webflow.

If your category filter stops working or shows no results, open Dynamic Map App to diagnose the issue. There are two common causes, and each has a straightforward fix.

Option 1: Filter is Out of Sync

If you've added, renamed, or removed option field values after creating the filter, the filter chips can become out of sync with your CMS data. Dynamic Map App flags these with an Unsynced badge.

Dynamic Map App Filter and Sorting panel showing category filters with Unsynced badges indicating they need to be updated.
Dynamic Map App Filter and Sorting panel showing category filters with Unsynced badges indicating they need to be updated.

To fix it:

  1. Click Edit on the out-of-sync filter and add the missing filter chips.
  2. Click Insert Code in Dynamic Map App to ensure the code snippet in your Webflow project is up to date.

See Map Category Filter for the full resyncing walkthrough.

Option 2: Empty Option Fields

If any CMS item has an empty option field value, the entire category filter stops working — not just that one item. Every item must have a value assigned.

Webflow CMS item editor showing an empty option field that is causing the category filter to fail.
Webflow CMS item editor showing an empty option field that is causing the category filter to fail.

The fix: create a placeholder option called "empty", assign it to every item without a real category value, and hide that chip from the map UI so visitors never see it.

Webflow CMS item editor showing the empty placeholder option assigned to fix a broken category filter.
Webflow CMS item editor showing the empty placeholder option assigned to fix a broken category filter.

💡 Pro Tip: Use Webflow's CSV import to batch-assign the "empty" value across many items at once — far faster than editing each item individually.