diff --git a/parsers/survex.py b/parsers/survex.py
index bd05010..e1e017a 100644
--- a/parsers/survex.py
+++ b/parsers/survex.py
@@ -1448,11 +1448,11 @@ def MakeSurvexFileRoot():
     """
     # find a cave, any cave..
     caves = Cave.objects.all()
-    smk = caves.filter(kataster_number="000")
+    smk = caves.filter(kataster_number="000") # returns a list, a QuerySet
     
     fileroot = SurvexFile(path=settings.SURVEX_TOPNAME, cave=None)
     fileroot.save()
-    directoryroot = SurvexDirectory(path=settings.SURVEX_DATA, cave=smk, primarysurvexfile=fileroot)
+    directoryroot = SurvexDirectory(path=settings.SURVEX_DATA, cave=smk[0], primarysurvexfile=fileroot)
     # MariaDB doesn't like this hack. Complains about non-null cave_id EVEN THOUGH our model file says this is OK:
     # cave = models.ForeignKey('Cave', blank=True, null=True,on_delete=models.SET_NULL)
     directoryroot.save()