diff --git a/newsroom/users/forms.py b/newsroom/users/forms.py
index 3cbd68dff..09c537ad7 100644
--- a/newsroom/users/forms.py
+++ b/newsroom/users/forms.py
@@ -16,7 +16,9 @@ def _value(self):
             return ""
 
     def process_formdata(self, valuelist):
-        if valuelist == [""]:  # An empty string from the client is equal to an empty array
+        if (
+            valuelist == [""] or valuelist == [None] or valuelist == ["None"]
+        ):  # An empty string from the client is equal to an empty array
             self.data = []
         elif len(valuelist):
             self.data = [x.strip() for x in valuelist[0].split(",")]