diff -r 764381756899 -r 62373840e33a src/model.h
--- a/src/model.h	Wed Mar 11 19:05:34 2020 +0200
+++ b/src/model.h	Tue Mar 17 23:13:29 2020 +0200
@@ -135,5 +135,12 @@
 	{
 		*index_out = index;
 	}
-	return static_cast<const R*>(this->objectAt(index));
+	if (index.isValid())
+	{
+		return static_cast<const R*>(this->objectAt(index));
+	}
+	else
+	{
+		return nullptr;
+	}
 }