diff --git a/includes/data-stores/class-wc-product-variable-data-store-cpt.php b/includes/data-stores/class-wc-product-variable-data-store-cpt.php
index 3c5cd6949e6..237ef7ebf47 100644
--- a/includes/data-stores/class-wc-product-variable-data-store-cpt.php
+++ b/includes/data-stores/class-wc-product-variable-data-store-cpt.php
@@ -264,7 +264,7 @@ class WC_Product_Variable_Data_Store_CPT extends WC_Product_Data_Store_CPT imple
 	public function child_has_weight( $product ) {
 		global $wpdb;
 		$children = $product->get_visible_children();
-		return $children ? (bool) $wpdb->get_var( "SELECT 1 FROM $wpdb->postmeta WHERE meta_key = '_weight' AND meta_value > 0 AND post_id IN ( " . implode( ',', array_map( 'absint', $children ) ) . " )" ) : false;
+		return $children ? null !== $wpdb->get_var( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key = '_weight' AND meta_value > 0 AND post_id IN ( " . implode( ',', array_map( 'absint', $children ) ) . " )" ) : false;
 	}
 
 	/**
@@ -277,7 +277,7 @@ class WC_Product_Variable_Data_Store_CPT extends WC_Product_Data_Store_CPT imple
 	public function child_has_dimensions( $product ) {
 		global $wpdb;
 		$children = $product->get_visible_children();
-		return $children ? (bool) $wpdb->get_var( "SELECT 1 FROM $wpdb->postmeta WHERE meta_key IN ( '_length', '_width', '_height' ) AND meta_value > 0 AND post_id IN ( " . implode( ',', array_map( 'absint', $children ) ) . " )" ) : false;
+		return $children ? null !== $wpdb->get_var( "SELECT post_id FROM $wpdb->postmeta WHERE meta_key IN ( '_length', '_width', '_height' ) AND meta_value > 0 AND post_id IN ( " . implode( ',', array_map( 'absint', $children ) ) . " )" ) : false;
 	}
 
 	/**