X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/f681a59fe987944e665fca8b0796b38ae24d0d98..239fd9a073f8af8ca67aa050e8a34a843e53e0c2:/apps/catalogue/models/book.py

diff --git a/apps/catalogue/models/book.py b/apps/catalogue/models/book.py
index 772634c6..4d1b12e4 100755
--- a/apps/catalogue/models/book.py
+++ b/apps/catalogue/models/book.py
@@ -205,7 +205,8 @@ class Book(models.Model):
         # and move the gallery starts
         if gm.was_merged:
                 for chunk in self[len(self) - len_other:]:
-                        chunk.gallery_start += gm.dest_size - gm.num_deleted
+                        old_start = chunk.gallery_start or 1
+                        chunk.gallery_start = old_start + gm.dest_size - gm.num_deleted
                         chunk.save()
 
         other.delete()