diff --git a/bijoe/visualization/utils.py b/bijoe/visualization/utils.py
index 852b251..a176791 100644
--- a/bijoe/visualization/utils.py
+++ b/bijoe/visualization/utils.py
@@ -125,9 +125,21 @@ class Visualization:
                 errors.append(_('Dimension %s does not exist.') % e)
 
         filters = d.get('filters', {})
+        for dimension_name in list(filters):
+            try:
+                cube.dimensions[dimension_name]
+            except schemas.DimensionNotFound as e:
+                filters.pop(dimension_name)
+                errors.append(_('Filter %s does not exist.') % e)
+
         loop = d.get('loop')
         if loop:
-            loop = cube.dimensions[loop]
+            try:
+                loop = cube.dimensions[d.get('loop')]
+            except schemas.DimensionNotFound as e:
+                errors.append(_('Dimension %s does not exist.') % e)
+                loop = None
+
         visualization = cls(
             cube,
             representation,
diff --git a/bijoe/visualization/views.py b/bijoe/visualization/views.py
index 4e2fb65..4426c32 100644
--- a/bijoe/visualization/views.py
+++ b/bijoe/visualization/views.py
@@ -372,15 +372,18 @@ class VisualizationJSONView(generics.GenericAPIView):
         unit = 'seconds' if all_visualizations.measure.type == 'duration' else None
         measure = all_visualizations.measure.type
 
-        return Response(
-            {
-                'data': data,
-                'axis': axis,
-                'format': '1',
-                'unit': unit,  # legacy, prefer measure.
-                'measure': measure,
-            }
-        )
+        response = {
+            'data': data,
+            'axis': axis,
+            'format': '1',
+            'unit': unit,  # legacy, prefer measure.
+            'measure': measure,
+        }
+        if all_visualizations.cube.warnings:
+            response['warnings'] = all_visualizations.cube.warnings
+        if all_visualizations.errors:
+            response['errors'] = all_visualizations.errors
+        return Response(response)
 
 
 class ExportVisualizationView(views.AuthorizationMixin, DetailView):
diff --git a/tests/test_views.py b/tests/test_views.py
index 4c6fead..5d27b7a 100644
--- a/tests/test_views.py
+++ b/tests/test_views.py
@@ -20,6 +20,7 @@ import json
 from unittest import mock
 
 import pytest
+from django.test import override_settings
 from django.urls import reverse
 from django.utils.encoding import force_bytes
 from utils import login
@@ -123,6 +124,10 @@ def test_visualization_json_api(schema1, app, admin, visualization):
         'format': '1',
         'unit': None,
         'measure': 'integer',
+        'warnings': [
+            "le champ « pouët » n'est pas bon",
+            'warning2',
+        ],
     }
 
 
@@ -159,6 +164,10 @@ def test_visualization_json_api_duration(schema1, app, admin, visualization):
         'format': '1',
         'unit': 'seconds',
         'measure': 'duration',
+        'warnings': [
+            "le champ « pouët » n'est pas bon",
+            'warning2',
+        ],
     }
 
 
@@ -279,6 +288,7 @@ def test_import_visualization(schema1, app, admin, visualization, settings, free
     assert Visualization.objects.count() == 3
 
 
+@override_settings(LANGUAGE_CODE='en-us')
 def test_save_as(schema1, app, admin, visualization):
     login(app, admin)
     resp = app.get('/visualization/%s/' % visualization.id)
@@ -332,9 +342,42 @@ def test_mellon_idp_redirections(mocked_resolv_url, mocked_get_idps, app):
 
 
 def test_visualization_json_api_dimension_not_found(schema1, app, admin, visualization):
+    visualization.parameters['drilldown_x'] = 'foo'
+    visualization.parameters['drilldown_y'] = 'bar'
+    visualization.parameters['loop'] = 'zob'
     visualization.parameters['filters']['coin'] = '1'
     visualization.save()
 
     login(app, admin)
-    resp = app.get(reverse('visualization-json', kwargs={'pk': visualization.id}), status=400)
-    assert resp.json == {'err': 'dimension-not-found', 'err_desc': 'coin'}
+    resp = app.get(reverse('visualization-json', kwargs={'pk': visualization.id}), status=200)
+    assert resp.json['warnings'] == [
+        "le champ « pouët » n'est pas bon",
+        'warning2',
+    ]
+    assert resp.json['errors'] == [
+        'La dimension «\xa0foo\xa0» n’existe pas.',
+        'La dimension «\xa0bar\xa0» n’existe pas.',
+        'La dimension «\xa0coin\xa0» n’existe pas, le filtre sera ignoré.',
+        'La dimension «\xa0zob\xa0» n’existe pas.',
+    ]
+
+
+def test_visualization_dimension_not_found(schema1, app, admin, visualization):
+    visualization.parameters['drilldown_x'] = 'foo'
+    visualization.parameters['drilldown_y'] = 'bar'
+    visualization.parameters['loop'] = 'zob'
+    visualization.parameters['filters']['coin'] = '1'
+    visualization.save()
+
+    login(app, admin)
+    resp = app.get(reverse('visualization', kwargs={'pk': visualization.id}), status=200)
+    assert [elt.text() for elt in resp.pyquery('ul.messages li.warning').items()] == [
+        "le champ « pouët » n'est pas bon",
+        'warning2',
+    ]
+    assert [elt.text() for elt in resp.pyquery('ul.messages li.error').items()] == [
+        'La dimension «\xa0foo\xa0» n’existe pas.',
+        'La dimension «\xa0bar\xa0» n’existe pas.',
+        'La dimension «\xa0coin\xa0» n’existe pas, le filtre sera ignoré.',
+        'La dimension «\xa0zob\xa0» n’existe pas.',
+    ]