Index: 8.0.4/gui/storage/views.py
===================================================================
--- 8.0.4/gui/storage/views.py  (revision 6454)
+++ 8.0.4/gui/storage/views.py  (working copy)
@@ -312,6 +312,7 @@
 def dataset_create(request):
     defaults = { 'dataset_compression' : 'inherit', 'dataset_atime' : 'inherit', }
     dataset_form = forms.ZFSDataset_CreateForm(initial=defaults)
+    dedup_enabled = forms._dedup_enabled()
     if request.method == 'POST':
         dataset_form = forms.ZFSDataset_CreateForm(request.POST)
         if dataset_form.is_valid():
@@ -344,12 +345,12 @@
                 mp = models.MountPoint(mp_volume=volume, mp_path='/mnt/%s' % (dataset_name), mp_options='rw,late', mp_ischild=True)
                 mp.save()
                 return HttpResponse(simplejson.dumps({"error": False, "message": _("Dataset successfully added.")}), mimetype="application/json")
-            else:
+            elif dedup_enabled:
                 dataset_form.set_error(errmsg)
                 dataset_form.errors['dataset_dedup'] = (DEDUP_ERROR, )
-        else:
+        elif dedup_enabled:
             dataset_form.errors['dataset_dedup'] = (DEDUP_ERROR, )
-    else:
+    elif dedup_enabled:
         dataset_form.errors['dataset_dedup'] = (DEDUP_ERROR, )
     return render(request, 'storage/datasets.html', {
         'focused_tab' : 'storage',