diff --git a/pandora/document/models.py b/pandora/document/models.py
index 9115eb50..26e97e71 100644
--- a/pandora/document/models.py
+++ b/pandora/document/models.py
@@ -225,17 +225,18 @@ class Document(models.Model):
             if os.path.exists(src):
                 if size and page:
                     crop = map(int, page.split(','))
-                    path = os.path.join(folder, '%s.jpg' % ','.join(map(str, crop)))
-                    if not os.path.exists(path):
-                        img = Image.open(src).crop(crop)
-                        img.save(path)
-                    else:
-                        img = Image.open(path)
-                    src = path
-                    if size < max(img.size):
-                        path = os.path.join(folder, '%sp%s.jpg' % (size, ','.join(map(str, crop))))
+                    if len(crop) == 4:
+                        path = os.path.join(folder, '%s.jpg' % ','.join(map(str, crop)))
                         if not os.path.exists(path):
-                            resize_image(src, path, size=size)
+                            img = Image.open(src).crop(crop)
+                            img.save(path)
+                        else:
+                            img = Image.open(path)
+                        src = path
+                        if size < max(img.size):
+                            path = os.path.join(folder, '%sp%s.jpg' % (size, ','.join(map(str, crop))))
+                            if not os.path.exists(path):
+                                resize_image(src, path, size=size)
         if os.path.exists(src) and not os.path.exists(path):
             image_size = max(self.width, self.height)
             if image_size == -1: