diff --git a/hasaki_crawler_engine/hasaki_product_info.py b/hasaki_crawler_engine/hasaki_product_info.py
index 0fd9605..d2d9693 100644
--- a/hasaki_crawler_engine/hasaki_product_info.py
+++ b/hasaki_crawler_engine/hasaki_product_info.py
@@ -400,7 +400,7 @@ class HasakiProductInfo:
             except:
                 pass
 
-            reviews = reviews1 + reviews2
+            reviews = self.join_lists(reviews1, reviews2)
 
 
 
@@ -446,7 +446,17 @@ class HasakiProductInfo:
         except Exception as e:
             logging.info(e)
 
-
+    def join_lists(self, list1, list2):
+        # Check if both lists are None
+        if list1 is None and list2 is None:
+            return None
+        # Check if one of the lists is None
+        elif list1 is None:
+            return list2
+        elif list2 is None:
+            return list1
+        else:
+            return list1 + list2
 
     def seo_info(self, raw_data):