diff --git a/app/main/reports/pdf_document/pdf_document_manager.py b/app/main/reports/pdf_document/pdf_document_manager.py
index 9c72dc3a..b9471179 100644
--- a/app/main/reports/pdf_document/pdf_document_manager.py
+++ b/app/main/reports/pdf_document/pdf_document_manager.py
@@ -33,9 +33,10 @@ def page_images(self, page_without_pril):
             page = self.pdf_file[page_num]
             images = self.pdf_file.get_page_images(page)
             for image in images:
-                image_coord = page.get_image_bbox(image[7], transform=0)
-                total_height += (image_coord[3] - image_coord[1])
-
+                image_coord = page.get_image_bbox(image[7], transform=0)    # might be [1.0, 1.0, -1.0, -1.0]
+                image_height = image_coord[3] - image_coord[1]
+                if image_height > 0:
+                    total_height += image_height
         return total_height
 
     def page_height(self, page_without_pril):