diff --git a/core/models_caves.py b/core/models_caves.py
index ac6dd34..0027a29 100644
--- a/core/models_caves.py
+++ b/core/models_caves.py
@@ -125,7 +125,7 @@ class Cave(TroggleModel):
         return urljoin(settings.URL_ROOT, reverse('cave',kwargs={'cave_id':href,}))
 
     def __str__(self, sep = ": "):
-        return str("slug:"+self.slug())
+        return str("slug:"+str(self.slug()))
 
     def get_QMs(self):
         return QM.objects.filter(found_by__cave_slug=self.caveslug_set.all())
diff --git a/core/views_caves.py b/core/views_caves.py
index 943e797..8613790 100644
--- a/core/views_caves.py
+++ b/core/views_caves.py
@@ -72,16 +72,30 @@ def caveKey(x):
     """ 
     return x.kataster_number
 
+def getnotablecaves():
+    notablecaves = []
+    for kataster_number in settings.NOTABLECAVESHREFS:
+        try:
+            cave = Cave.objects.get(kataster_number=kataster_number)
+            notablecaves.append(cave)
+        except:
+            print(" ! FAILED to get only one cave per kataster_number for: "+kataster_number)
+            caves = Cave.objects.all().filter(kataster_number=kataster_number)
+            for c in caves:
+                print(c.kataster_number, c.slug())
+                if c.slug() != None:
+                    notablecaves.append(c)
+    return notablecaves
+
+
 def caveindex(request):
     caves = Cave.objects.all()
-    notablecavehrefs = settings.NOTABLECAVESHREFS
-    notablecaves = [Cave.objects.get(kataster_number=kataster_number)  for kataster_number in notablecavehrefs ]
     caves1623 = list(Cave.objects.filter(area__short_name = "1623"))
     caves1626 = list(Cave.objects.filter(area__short_name = "1626"))
     #python2 to python3 issue https://realpython.com/python-sort/
     caves1623.sort(key=caveKey)
     caves1626.sort(key=caveKey)
-    return render(request,'caveindex.html', {'caves1623': caves1623, 'caves1626': caves1626, 'notablecaves':notablecaves, 'cavepage': True})
+    return render(request,'caveindex.html', {'caves1623': caves1623, 'caves1626': caves1626, 'notablecaves':getnotablecaves(), 'cavepage': True})
 
 def cave3d(request, cave_id=''):
     cave = getCave(cave_id)
diff --git a/flatpages/views.py b/flatpages/views.py
index 1905461..eb8720c 100644
--- a/flatpages/views.py
+++ b/flatpages/views.py
@@ -27,6 +27,14 @@ def flatpage(request, path):
         return troggle.core.views_caves.caveSlug(request, r.slug())
     except Cave.DoesNotExist:
         pass
+    except:
+        print(" ! FAILED to get only one cave per slug for: "+path)
+        caves = Cave.objects.all().filter(url = path)
+        for c in caves:
+            print(path, c.slug())
+            if c.slug() != None:
+                return troggle.core.views_caves.caveSlug(request, c.slug())
+        pass
 
     try:
         r = EntranceRedirect.objects.get(originalURL = path)