Resolves #373

lib/home_assistant.class.dart

@@ -262,7 +262,7 @@ class HomeAssistant {
     await _sendInitialMessage("get_panels").then((data) {
       if (data["success"]) {
         data["result"].forEach((k,v) {
-            String title = v['title'] == null ? "${k[0].toUpperCase()}${k.substring(1)}" : "${v['title'][0].toUpperCase()}${v['title'].substring(1)}";
+            String title = v['title'] == null ? "${k[0]?.toUpperCase()}${k?.substring(1)}" : "${v['title'][0]?.toUpperCase()}${v['title']?.substring(1)}";
             panels.add(Panel(
                 id: k,
                 type: v["component_name"],

lib/ui_class/view.class.dart

@@ -85,7 +85,7 @@ class HAView {
       } else {
         return
           Tab(
-              text: name.toUpperCase(),
+              text: "${name?.toUpperCase()}",
           );
       }
     } else {
@@ -99,7 +99,7 @@ class HAView {
         );
       } else {
         return Tab(
-            text: linkedEntity.displayName.toUpperCase(),
+            text: "${linkedEntity?.displayName?.toUpperCase()}",
         );
       }
 

lib/ui_widgets/card_widget.dart

@@ -243,7 +243,7 @@ class CardWidget extends StatelessWidget {
 
   Widget _buildEntityButtonCard(BuildContext context) {
     card.linkedEntityWrapper.displayName = card.name?.toUpperCase() ??
-        card.linkedEntityWrapper.displayName.toUpperCase();
+        card.linkedEntityWrapper.displayName?.toUpperCase();
     return Card(
         child: EntityModel(
             entityWrapper: card.linkedEntityWrapper,