X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/84e2c528c61c6018ab21d1729ee32f34d3653b8e..94f422ac82d9af46410c63775e4aeea77395a730:/apps/catalogue/models/book.py

diff --git a/apps/catalogue/models/book.py b/apps/catalogue/models/book.py
index 772b1217..4fbd194f 100755
--- a/apps/catalogue/models/book.py
+++ b/apps/catalogue/models/book.py
@@ -271,6 +271,8 @@ class Book(models.Model):
     def get_on_track(self):
         if self.published:
             return -1
+        if len(self) == 0:
+            return -1
         return min(ch.stage.ordering for ch in self) or 0
     on_track = cached_in_field('_on_track')(get_on_track)