diff --git a/abonapp/templates/abonapp/peoples.html b/abonapp/templates/abonapp/peoples.html
index 9771642..b1a63e5 100644
--- a/abonapp/templates/abonapp/peoples.html
+++ b/abonapp/templates/abonapp/peoples.html
@@ -117,10 +117,14 @@
                             {% endfor %}
                         </td>
                         <td class="col-xs-2">
-                            {% if perms.abonapp.can_ping %}
+                            {% if perms.abonapp.can_ping and human.ip_address %}
                                 <a href="{% url 'abonapp:ping' group.pk human.username %}" class="btn btn-default btn-sm btn-cmd" data-param="{{ human.ip_address }}">
                                     <span class="glyphicon glyphicon-flash"></span>
                                 </a>
+                            {% else %}
+                                <a href="#" class="btn btn-default btn-sm" disabled >
+                                    <span class="glyphicon glyphicon-flash"></span>
+                                </a>
                             {% endif %}
                         </td>
                         </tr>
diff --git a/devapp/base_intr.py b/devapp/base_intr.py
index 73eef09..fb2fe7f 100644
--- a/devapp/base_intr.py
+++ b/devapp/base_intr.py
@@ -23,7 +23,6 @@ class DeviceConfigurationError(DeviceImplementationError):
 
 class DevBase(object, metaclass=ABCMeta):
     def __init__(self, dev_instance=None):
-        super().__init__()
         self.db_instance = dev_instance
 
     @property