diff --git a/src/Mod/Fem/femguiobjects/ViewProviderFemConstraint.py b/src/Mod/Fem/femguiobjects/ViewProviderFemConstraint.py
index 995827c86f..9ac32cc9ed 100644
--- a/src/Mod/Fem/femguiobjects/ViewProviderFemConstraint.py
+++ b/src/Mod/Fem/femguiobjects/ViewProviderFemConstraint.py
@@ -97,8 +97,7 @@ class ViewProxy(object):
             FreeCAD.Console.PrintError(message + "\n")
         return True
 
-    def __getstate__(self):
-        return None
-
+    # a few objects had this method in their class before the move to this base class
+    # these objects will give a setAttr failed error on document loading without this method
     def __setstate__(self, state):
         return None
diff --git a/src/Mod/Fem/femobjects/FemConstraint.py b/src/Mod/Fem/femobjects/FemConstraint.py
index 56001fe94b..2a962c2a19 100644
--- a/src/Mod/Fem/femobjects/FemConstraint.py
+++ b/src/Mod/Fem/femobjects/FemConstraint.py
@@ -37,4 +37,10 @@ class Proxy(object):
         self.Object = obj  # keep a ref to the DocObj for nonGui usage
         obj.Proxy = self  # link between App::DocumentObject to this object
 
+    # a few objects had this method in their class before the move to this base class
+    # these objects will give a setAttr failed error on document loading without this method
+    def __setstate__(self, state):
+        if state:
+            self.Type = state
+
 ##  @}