diff --git a/anatomy/filters.py b/anatomy/filters.py
index aa5d14c8..f8268b82 100644
--- a/anatomy/filters.py
+++ b/anatomy/filters.py
@@ -30,8 +30,8 @@ def get_authors(request):
 
 
 class AnatomyQuestionFilter(django_filters.FilterSet):
-    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams)
-    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors)
+    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
+    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
     class Meta:
         model = AnatomyQuestion
         fields = ("question_type",
diff --git a/longs/filters.py b/longs/filters.py
index fe664067..a3d8c5bc 100755
--- a/longs/filters.py
+++ b/longs/filters.py
@@ -27,8 +27,8 @@ def get_authors(request):
 
 
 class LongFilter(django_filters.FilterSet):
-    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams)
-    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors)
+    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
+    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
     class Meta:
         model = Long
         fields = (#"site", 
diff --git a/rapids/filters.py b/rapids/filters.py
index 37072de5..81de43a6 100755
--- a/rapids/filters.py
+++ b/rapids/filters.py
@@ -26,8 +26,8 @@ def get_authors(request):
     return queryset
 
 class RapidFilter(django_filters.FilterSet):
-    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams)
-    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors)
+    exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
+    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
     class Meta:
         model = Rapid
         fields = ("normal", "abnormality", "region", "examination",
diff --git a/sbas/filters.py b/sbas/filters.py
index 6457ca52..57e1e6d5 100644
--- a/sbas/filters.py
+++ b/sbas/filters.py
@@ -31,7 +31,7 @@ def get_authors(request):
 
 class QuestionFilter(django_filters.FilterSet):
     exams = django_filters.ModelMultipleChoiceFilter(queryset=get_exams, null_label="No exam")
-    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors)
+    author = django_filters.ModelMultipleChoiceFilter(queryset=get_authors, null_label="No author")
     class Meta:
         model = Question
         fields = ("exams", "category", "created_date")