diff --git a/openslides/core/serializers.py b/openslides/core/serializers.py
index 71f154842..fd72cdb36 100644
--- a/openslides/core/serializers.py
+++ b/openslides/core/serializers.py
@@ -80,7 +80,8 @@ class ProjectorMessageSerializer(ModelSerializer):
         fields = ('id', 'message', )
 
     def validate(self, data):
-        data['message'] = validate_html(data.get('message', ''))
+        if 'message' in data:
+            data['message'] = validate_html(data['message'])
         return data
 
 
diff --git a/openslides/motions/serializers.py b/openslides/motions/serializers.py
index ef7b90a27..1dabd9a05 100644
--- a/openslides/motions/serializers.py
+++ b/openslides/motions/serializers.py
@@ -259,7 +259,8 @@ class MotionChangeRecommendationSerializer(ModelSerializer):
             'creation_time',)
 
     def validate(self, data):
-        data['text'] = validate_html(data.get('text', ''))
+        if 'text' in data:
+            data['text'] = validate_html(data['text'])
         return data
 
 
@@ -311,8 +312,10 @@ class MotionSerializer(ModelSerializer):
         read_only_fields = ('state', 'recommendation',)  # Some other fields are also read_only. See definitions above.
 
     def validate(self, data):
-        data['text'] = validate_html(data.get('text', ''))
-        data['reason'] = validate_html(data.get('reason', ''))
+        if 'text'in data:
+            data['text'] = validate_html(data['text'])
+        if 'reason' in data:
+            data['reason'] = validate_html(data['reason'])
         validated_comments = []
         for comment in data.get('comments', []):
             validated_comments.append(validate_html(comment))
diff --git a/openslides/motions/static/js/motions/motion-services.js b/openslides/motions/static/js/motions/motion-services.js
index fe73bbffb..b533dad92 100644
--- a/openslides/motions/static/js/motions/motion-services.js
+++ b/openslides/motions/static/js/motions/motion-services.js
@@ -187,9 +187,6 @@ angular.module('OpenSlidesApp.motions.motionservices', ['OpenSlidesApp.motions',
                         return motion['comment ' + field.name];
                     },
                     function (obj) {
-                        motion.title = motion.getTitle(-1);
-                        motion.text = motion.getText(-1);
-                        motion.reason = motion.getReason(-1);
                         motion['comment ' + field.name] = obj.editor.getData();
                     }
                 );
diff --git a/openslides/motions/static/js/motions/site.js b/openslides/motions/static/js/motions/site.js
index 0f238559f..115479679 100644
--- a/openslides/motions/static/js/motions/site.js
+++ b/openslides/motions/static/js/motions/site.js
@@ -844,13 +844,8 @@ angular.module('OpenSlidesApp.motions.site', [
             return _.indexOf(motion.tags_id, tag.id) > -1;
         };
 
-        // Use this methon instead of Motion.save(), because otherwise
-        // you have to provide always a title and a text
         $scope.save = function (motion) {
-            motion.title = motion.getTitle(-1);
-            motion.text = motion.getText(-1);
-            motion.reason = motion.getReason(-1);
-            Motion.save(motion);
+            Motion.save(motion, {method: 'PATCH'});
         };
         // delete single motion
         $scope.delete = function (motion) {
@@ -1134,10 +1129,7 @@ angular.module('OpenSlidesApp.motions.site', [
             ngDialog.open(MotionForm.getDialog(motion));
         };
         $scope.save = function (motion) {
-            motion.title = motion.getTitle(-1);
-            motion.text = motion.getText(-1);
-            motion.reason = motion.getReason(-1);
-            Motion.save(motion);
+            Motion.save(motion, {method: 'PATCH'});
         };
         // support
         $scope.support = function () {
diff --git a/openslides/topics/serializers.py b/openslides/topics/serializers.py
index bd774c679..f948033fb 100644
--- a/openslides/topics/serializers.py
+++ b/openslides/topics/serializers.py
@@ -13,5 +13,6 @@ class TopicSerializer(ModelSerializer):
         fields = ('id', 'title', 'text', 'attachments', 'agenda_item_id')
 
     def validate(self, data):
-        data['text'] = validate_html(data.get('text', ''))
+        if 'text' in data:
+            data['text'] = validate_html(['text'])
         return data