diff --git a/core/models_caves.py b/core/models_caves.py
index 2a80218..e4b3792 100644
--- a/core/models_caves.py
+++ b/core/models_caves.py
@@ -52,7 +52,7 @@ class CaveSlug(models.Model):
 class Cave(TroggleModel):
     # too much here perhaps, 
     official_name = models.CharField(max_length=160)
-    area = models.ManyToManyField(Area, blank=True, null=True)
+    area = models.ManyToManyField(Area, blank=True)
     kataster_code = models.CharField(max_length=20,blank=True,null=True)
     kataster_number = models.CharField(max_length=10,blank=True, null=True)
     unofficial_number = models.CharField(max_length=60,blank=True, null=True)
@@ -376,9 +376,9 @@ class CaveDescription(TroggleModel):
     short_name = models.CharField(max_length=50, unique = True)
     long_name = models.CharField(max_length=200, blank=True, null=True)
     description = models.TextField(blank=True,null=True)
-    linked_subcaves = models.ManyToManyField("NewSubCave", blank=True,null=True)
-    linked_entrances = models.ManyToManyField("Entrance", blank=True,null=True)
-    linked_qms = models.ManyToManyField("QM", blank=True,null=True)
+    linked_subcaves = models.ManyToManyField("NewSubCave", blank=True)
+    linked_entrances = models.ManyToManyField("Entrance", blank=True)
+    linked_qms = models.ManyToManyField("QM", blank=True)
 
     def __str__(self):
         if self.long_name: