Ticket #11192: ModelForms_checks.patch

models.py

@@ -215 +215 @@
         opts = self._meta
         if instance is None:
             # if we didn't get an instance, instantiate a new one
+            
+            # we should to check if model is in opts before creating instance
+            if not hasattr(opts, 'model') or opts.model is None:
+                raise ValueError('model attribute is not set in ModelForm or None')
+
+            # and need to check if instance is callable
+            if not callable(opts.model):
+                raise TypeError('model should be callable')
+
             self.instance = opts.model()
             object_data = {}
         else: