diff --git a/photo_review/auto_photo_review.py b/photo_review/auto_photo_review.py
index 3cde772..014ab10 100644
--- a/photo_review/auto_photo_review.py
+++ b/photo_review/auto_photo_review.py
@@ -141,7 +141,9 @@ def information_extraction(phrec, pk_phhd):
             if split_result['img'] is None:
                 continue
             a4_img = image_util.expand_to_a4_size(split_result['img'])
-            ocr_result += model_util.ocr(a4_img)
+            tmp_ocr_result = model_util.ocr(a4_img)
+            if tmp_ocr_result:
+                ocr_result += tmp_ocr_result
         tmp_ocr_text = common_util.ocr_result_to_text(ocr_result)
 
         tmp_rec_type = model_util.clas_text(tmp_ocr_text) if ocr_text else None