diff --git a/vendor/mirasvit/module-seo/src/SeoSitemap/Preference/ResourceModel/Product.php b/vendor/mirasvit/module-seo/src/SeoSitemap/Preference/ResourceModel/Product.php
index f164728f8..f0b9632c3 100644
--- a/vendor/mirasvit/module-seo/src/SeoSitemap/Preference/ResourceModel/Product.php
+++ b/vendor/mirasvit/module-seo/src/SeoSitemap/Preference/ResourceModel/Product.php
@@ -142,7 +142,7 @@ class Product extends \Magento\Sitemap\Model\ResourceModel\Catalog\Product
                 }
             } else {
                 $this->_joinAttribute($store->getId(), 'name');
-                if (strpos($this->_select->__toString(), 'AS `t2_name`') === false) {
+                if (strpos((string)$this->_select->__toString(), 'AS `t2_name`') === false) {
                     $this->_select->columns(
                         ['name' => $this->getConnection()->getIfNullSql('t1_name.value')]
                     );
@@ -285,7 +285,7 @@ class Product extends \Magento\Sitemap\Model\ResourceModel\Catalog\Product
             $image = $this->friendlyImageUrlService->getFriendlyImageName($product, $image);
         }
 
-        if (strpos($image, '.gif') === false) {
+        if (strpos((string)$image, '.gif') === false) {
             $imageHelper = $this->catalogImageHelper->init($product, 'product_page_image_small')
                 ->setImageFile($image)
                 ->resize(800, 600);
@@ -329,7 +329,7 @@ class Product extends \Magento\Sitemap\Model\ResourceModel\Catalog\Product
             $imageUrlTemplate
         );
 
-        if (strpos($imageUrlTemplate, ']') !== false) {
+        if (strpos((string)$imageUrlTemplate, ']') !== false) {
             return false;
         }