Fix failed deserializing in web view

lib/data.dart

@@ -323,7 +323,9 @@ class SessionData {
     DisplayError = "";
     IsReadOnly = false;
     ContainsTripTimes = true;
-    FlutterBackground.disableBackgroundExecution();
+    if (FlutterBackground.isBackgroundExecutionEnabled) {
+      FlutterBackground.disableBackgroundExecution();
+    }
     WakelockPlus.disable();
     NBTHelper.CommitNBT(data: CompoundTag(), name: "appstate");
 
@@ -361,7 +363,9 @@ class SessionData {
 
     if (IsOnTheClock) {
       await Login();
-    } else {
+    }
+
+    if (!ct.containsKey("start")) {
       ResetAppSession();
       return;
     }
@@ -396,6 +400,8 @@ class SessionData {
         ct.get("current_delivery")!.asCompoundTag(),
       );
     }
+
+    print("Deserialized data: ${SnbtIo.writeToString(ct)}");
   }
 
   /// This private function will turn all the data into NBT, for both the cache state, and newer usage, for storing it on the server in a more compact format.