diff --git a/doofinder-for-woocommerce/doofinder-for-woocommerce.php b/doofinder-for-woocommerce/doofinder-for-woocommerce.php
index edbe7ae..5001ddc 100644
--- a/doofinder-for-woocommerce/doofinder-for-woocommerce.php
+++ b/doofinder-for-woocommerce/doofinder-for-woocommerce.php
@@ -3,7 +3,7 @@
  * Plugin Name: DOOFINDER Search and Discovery for WP & WooCommerce
  * License: GPLv2 or later
  * License URI: http://www.gnu.org/licenses/gpl-2.0.html
- * Version: 2.5.20
+ * Version: 2.5.21
  * Requires at least: 5.6
  * Requires PHP: 7.0
  * Author: Doofinder
diff --git a/doofinder-for-woocommerce/includes/api/endpoints/class-endpoint-product.php b/doofinder-for-woocommerce/includes/api/endpoints/class-endpoint-product.php
index ca7e05c..c06073b 100644
--- a/doofinder-for-woocommerce/includes/api/endpoints/class-endpoint-product.php
+++ b/doofinder-for-woocommerce/includes/api/endpoints/class-endpoint-product.php
@@ -437,7 +437,8 @@ private static function format_prices( $product ) {
 		$sale_price    = self::get_sale_price( $wc_product );
 
 		$product['regular_price'] = $regular_price;
-		$product['price']         = '' === (string) $regular_price ? $price : $regular_price;
+		// In some niche cases, we receive a regular_price of 0 but it is not the real regular_price.
+		$product['price']         = '' === (string) $regular_price || 0 == $regular_price ? $price : $regular_price;
 		$final_sale_price         = '' === (string) $sale_price || $price < $regular_price ? $price : $sale_price;
 
 		if ( empty( $final_sale_price ) || $final_sale_price === $regular_price ) {
diff --git a/doofinder-for-woocommerce/readme.txt b/doofinder-for-woocommerce/readme.txt
index b4549de..b8ddc05 100644
--- a/doofinder-for-woocommerce/readme.txt
+++ b/doofinder-for-woocommerce/readme.txt
@@ -1,11 +1,11 @@
 === DOOFINDER Search and Discovery for WP & WooCommerce ===
 Contributors: Doofinder
 Tags: search, autocomplete
-Version: 2.5.20
+Version: 2.5.21
 Requires at least: 5.6
 Tested up to: 6.7.1
 Requires PHP: 7.0
-Stable tag: 2.5.20
+Stable tag: 2.5.21
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -126,6 +126,9 @@ You can report security bugs through the Patchstack Vulnerability Disclosure Pro
 
 == Changelog ==
 
+= 2.5.21 =
+- Avoid setting a price of 0 when the regular price is 0.
+
 = 2.5.20 =
 - Prevented an error when the $image_sizes array is not initialized.
 
diff --git a/package-lock.json b/package-lock.json
index aae828a..b92f84e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "doofinder-woocommerce",
-  "version": "2.5.20",
+  "version": "2.5.21",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "doofinder-woocommerce",
-      "version": "2.5.20",
+      "version": "2.5.21",
       "license": "MIT",
       "devDependencies": {
         "grunt": "^1.0.1",
diff --git a/package.json b/package.json
index f905520..596376b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "doofinder-woocommerce",
-  "version": "2.5.20",
+  "version": "2.5.21",
   "description": "Integrate Doofinder in your WooCommerce site with (almost) no effort.",
   "main": "index.js",
   "scripts": {