diff --git a/plugins/woocommerce/changelog/fix-issue-36960 b/plugins/woocommerce/changelog/fix-issue-36960
new file mode 100644
index 00000000000..ceccf00278e
--- /dev/null
+++ b/plugins/woocommerce/changelog/fix-issue-36960
@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+
+Above notification threshold when "Out of stock threshold" filed value is empty
diff --git a/plugins/woocommerce/includes/abstracts/abstract-wc-product.php b/plugins/woocommerce/includes/abstracts/abstract-wc-product.php
index cd9385919e5..69e4d1f46c6 100644
--- a/plugins/woocommerce/includes/abstracts/abstract-wc-product.php
+++ b/plugins/woocommerce/includes/abstracts/abstract-wc-product.php
@@ -1386,7 +1386,7 @@ class WC_Product extends WC_Abstract_Legacy_Product {
 			return;
 		}
 
-		$stock_is_above_notification_threshold = ( $this->get_stock_quantity() > get_option( 'woocommerce_notify_no_stock_amount', 0 ) );
+		$stock_is_above_notification_threshold = ( (int) $this->get_stock_quantity() > absint( get_option( 'woocommerce_notify_no_stock_amount', 0 ) ) );
 		$backorders_are_allowed                = ( 'no' !== $this->get_backorders() );
 
 		if ( $stock_is_above_notification_threshold ) {
diff --git a/plugins/woocommerce/src/Internal/Settings/OptionSanitizer.php b/plugins/woocommerce/src/Internal/Settings/OptionSanitizer.php
index 2ecdba823fd..28969af4e7b 100644
--- a/plugins/woocommerce/src/Internal/Settings/OptionSanitizer.php
+++ b/plugins/woocommerce/src/Internal/Settings/OptionSanitizer.php
@@ -38,6 +38,8 @@ class OptionSanitizer {
 				2
 			);
 		}
+		// Cast "Out of stock threshold" field to absolute integer to prevent storing empty value.
+		self::add_filter( 'woocommerce_admin_settings_sanitize_option_woocommerce_notify_no_stock_amount', 'absint' );
 	}
 
 	/**
diff --git a/plugins/woocommerce/tests/legacy/unit-tests/product/class-wc-tests-product.php b/plugins/woocommerce/tests/legacy/unit-tests/product/class-wc-tests-product.php
index 2753bcef6d2..594a8199168 100644
--- a/plugins/woocommerce/tests/legacy/unit-tests/product/class-wc-tests-product.php
+++ b/plugins/woocommerce/tests/legacy/unit-tests/product/class-wc-tests-product.php
@@ -66,7 +66,7 @@ class WC_Tests_Product extends WC_Unit_Test_Case {
 	 *           [3, 4, false, "outofstock"]
 	 *
 	 * @param int    $stock_quantity Current stock quantity for the product.
-	 * @param bool   $notify_no_stock_amount Value for the woocommerce_notify_no_stock_amount option.
+	 * @param int    $notify_no_stock_amount Value for the woocommerce_notify_no_stock_amount option.
 	 * @param bool   $accepts_backorders Whether the product accepts backorders or not.
 	 * @param string $expected_stock_status The expected stock status of the product after being saved.
 	 */
diff --git a/plugins/woocommerce/tests/legacy/unit-tests/product/product-variable.php b/plugins/woocommerce/tests/legacy/unit-tests/product/product-variable.php
index 95a45fd5574..2c2d940b020 100644
--- a/plugins/woocommerce/tests/legacy/unit-tests/product/product-variable.php
+++ b/plugins/woocommerce/tests/legacy/unit-tests/product/product-variable.php
@@ -154,7 +154,7 @@ class WC_Tests_Product_Variable extends WC_Unit_Test_Case {
 	 *           [3, 4, false, "outofstock"]
 	 *
 	 * @param int    $stock_quantity Current stock quantity for the product.
-	 * @param bool   $notify_no_stock_amount Value for the woocommerce_notify_no_stock_amount option.
+	 * @param int    $notify_no_stock_amount Value for the woocommerce_notify_no_stock_amount option.
 	 * @param bool   $accepts_backorders Whether the product accepts backorders or not.
 	 * @param string $expected_stock_status The expected stock status of the product after being saved.
 	 */