diff --git a/src/UniversalValveToolbox/Model/ViewModel/FormProjectViewModel.cs b/src/UniversalValveToolbox/Model/ViewModel/FormProjectViewModel.cs
index 8e01695..8e31c6c 100644
--- a/src/UniversalValveToolbox/Model/ViewModel/FormProjectViewModel.cs
+++ b/src/UniversalValveToolbox/Model/ViewModel/FormProjectViewModel.cs
@@ -34,7 +34,7 @@ namespace UniversalValveToolbox.Model.ViewModel {
                 ForceUpdateField(value, ref selectProjectIndex);
                 OnPropertyChanged(nameof(SelectProject));
 
-                var index = Math.Max(engines.ToList().FindIndex(engine => engine.Appid == SelectProject.Engine), 0);
+                var index = Math.Max(engines.ToList().FindIndex(engine => engine.Appid == SelectProject?.Engine), -1);
   
                 SelectEngineIndex = index;
             }
diff --git a/src/UniversalValveToolbox/UI/FormProfiles.cs b/src/UniversalValveToolbox/UI/FormProfiles.cs
index eadc5cb..b1deeae 100644
--- a/src/UniversalValveToolbox/UI/FormProfiles.cs
+++ b/src/UniversalValveToolbox/UI/FormProfiles.cs
@@ -85,7 +85,8 @@ namespace UniversalValveToolbox {
         }
 
         private void comboBoxEngine_SelectedIndexChanged(object sender, EventArgs e) {
-            model.SelectProject.Engine = ((EngineDtoModel)comboBoxEngine.SelectedItem).Appid;
+            if (model.SelectProject != null)
+                model.SelectProject.Engine = ((EngineDtoModel)comboBoxEngine.SelectedItem).Appid;
         }
 
         private void comboBox_Mod_SelectedIndexChanged(object sender, EventArgs e) {