diff --git a/templates/dispositivo/show.htm b/templates/dispositivo/show.htm
index b2fdca5..e1d1a70 100644
--- a/templates/dispositivo/show.htm
+++ b/templates/dispositivo/show.htm
@@ -134,7 +134,7 @@
         <div class="form-group">
             <label class="col-xs-2" for="form-seriale">Numero Seriale</label>
             <div class="col-xs-10">
-                <input id="form-seriale" class="form-control" type="text" placeholder="Seriale" name="seriale" {% if dispositivo %}value="{{ dispositivo.seriale }}"{% elif request.args.get("scanned_barcode") %}value="{{ request.args.get('scanned_barcode') }}{% endif %}">
+                <input id="form-seriale" class="form-control" type="text" placeholder="Seriale" name="seriale" {% if dispositivo and dispositivo.seriale %}value="{{ dispositivo.seriale }}"{% elif request.args.get("scanned_barcode") %}value="{{ request.args.get('scanned_barcode') }}"{% endif %}>
             </div>
         </div>
         <div class="form-group">
@@ -156,7 +156,7 @@
         <div class="form-group">
             <label class="col-xs-2" for="form-ip">Hostname</label>
             <div class="col-xs-8">
-                <input id="form-hostname" class="form-control" type="text" placeholder="Hostname" name="hostname" {% if dispositivo %}value="{{ dispositivo.hostname }}"{% endif %}>
+                <input id="form-hostname" class="form-control" type="text" placeholder="Hostname" name="hostname" {% if dispositivo and dispositivo.hostname %}value="{{ dispositivo.hostname }}"{% endif %}>
             </div>
             <div class="col-xs-2">
                 <button class="form-control btn btn-info" onclick="calchostname()" type="button">Genera</button>