X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/a494a95bf89ed6aa55b5f14b71a343e33d55bd60..ff573698a8b017b1a70fafbfda44452b2c8d78c1:/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()