Title: Fatal error after adding a Date Range filter
Last modified: July 27, 2026

---

# Fatal error after adding a Date Range filter

 *  [tiranikos](https://wordpress.org/support/users/tiranikos/)
 * (@tiranikos)
 * [1 week, 5 days ago](https://wordpress.org/support/topic/fatal-error-after-adding-a-date-range-filter/)
 * Filter Everything 1.9.4 produces a fatal error after adding a Date Range filter
   for an ACF Date Picker field.
 * Meta key: `library_item_publication_date`
   WordPress: 7.0.2PHP: 8.3.28
 * Fatal error: `flrtBuildDateTimeString(): Argument #2 ($format) must be of type
   string, null given`, called from `src/Entities/PostDateEntity.php` line 306 and
   defined in `src/wpc-helpers.php` line 2689.
 * The Filter Set works normally until this date filter is added. After adding it,
   opening the Filter Set editor causes the fatal error.

Viewing 1 replies (of 1 total)

 *  Plugin Support [fesupportteam](https://wordpress.org/support/users/fesupportteam/)
 * (@fesupportteam)
 * [1 week, 4 days ago](https://wordpress.org/support/topic/fatal-error-after-adding-a-date-range-filter/#post-18975884)
 * Hi [@tiranikos](https://wordpress.org/support/users/tiranikos/)
 * Thank you for bringing this to our attention. We’ll check with the development
   team, and once we hear back from them, we’ll let you know right away.
 * Best regards,
   Victor

Viewing 1 replies (of 1 total)

You must be [logged in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Ffatal-error-after-adding-a-date-range-filter%2F%3Foutput_format%3Dmd&locale=en_US)
to reply to this topic.

 * ![](https://ps.w.org/filter-everything/assets/icon.svg?rev=3570563)
 * [Filter Everything — WordPress & WooCommerce Filters](https://wordpress.org/plugins/filter-everything/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/filter-everything/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/filter-everything/)
 * [Active Topics](https://wordpress.org/support/plugin/filter-everything/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/filter-everything/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/filter-everything/reviews/)

## Tags

 * [fatal error](https://wordpress.org/support/topic-tag/fatal-error/)

 * 1 reply
 * 2 participants
 * Last reply from: [fesupportteam](https://wordpress.org/support/users/fesupportteam/)
 * Last activity: [1 week, 4 days ago](https://wordpress.org/support/topic/fatal-error-after-adding-a-date-range-filter/#post-18975884)
 * Status: not resolved