diff --git a/cura/CrashHandler.py b/cura/CrashHandler.py
index c082578218..f51174aec0 100644
--- a/cura/CrashHandler.py
+++ b/cura/CrashHandler.py
@@ -85,14 +85,14 @@ class CrashHandler:
         dialog = QDialog()
         dialog.setMinimumWidth(500)
         dialog.setMinimumHeight(170)
-        dialog.setWindowTitle(catalog.i18nc("@title:window", "Cura Crashed"))
+        dialog.setWindowTitle(catalog.i18nc("@title:window", "Cura can't startup"))
         dialog.finished.connect(self._closeEarlyCrashDialog)
 
         layout = QVBoxLayout(dialog)
 
         label = QLabel()
-        label.setText(catalog.i18nc("@label crash message", """<p><b>A fatal error has occurred.</p></b>
-                    <p>Unfortunately, Cura encountered an unrecoverable error during start up. It was possibly caused by some incorrect configuration files. We suggest to backup and reset your configuration.</p>
+        label.setText(catalog.i18nc("@label crash message", """<p><b>Oops, Ultimaker Cura has encountered something that doesn't seem right.</p></b>
+                    <p>We encountered an unrecoverable error during start up. It was possibly caused by some incorrect configuration files. We suggest to backup and reset your configuration.</p>
                     <p>Backups can be found in the configuration folder.</p>
                     <p>Please send us this Crash Report to fix the problem.</p>
                 """))
@@ -220,7 +220,7 @@ class CrashHandler:
 
     def _messageWidget(self):
         label = QLabel()
-        label.setText(catalog.i18nc("@label crash message", """<p><b>A fatal error has occurred. Please send us this Crash Report to fix the problem</p></b>
+        label.setText(catalog.i18nc("@label crash message", """<p><b>A fatal error has occurred in Cura. Please send us this Crash Report to fix the problem</p></b>
             <p>Please use the "Send report" button to post a bug report automatically to our servers</p>
         """))
 
diff --git a/plugins/CuraEngineBackend/StartSliceJob.py b/plugins/CuraEngineBackend/StartSliceJob.py
index 89f9a144b0..0297a34385 100644
--- a/plugins/CuraEngineBackend/StartSliceJob.py
+++ b/plugins/CuraEngineBackend/StartSliceJob.py
@@ -239,7 +239,7 @@ class StartSliceJob(Job):
 
             for group in filtered_object_groups:
                 group_message = self._slice_message.addRepeatedMessage("object_lists")
-                if group[0].getParent().callDecoration("isGroup"):
+                if group[0].getParent() is not None and group[0].getParent().callDecoration("isGroup"):
                     self._handlePerObjectSettings(group[0].getParent(), group_message)
                 for object in group:
                     mesh_data = object.getMeshData()