diff --git a/src/FactSystem/FactControls/FactComboBox.qml b/src/FactSystem/FactControls/FactComboBox.qml
index 7c61bd4278cc099ff2841ecc5b2b0d14117caae2..d56bbf11fc4ffc2a7c5115e76d7cd103639f6333 100644
--- a/src/FactSystem/FactControls/FactComboBox.qml
+++ b/src/FactSystem/FactControls/FactComboBox.qml
@@ -10,7 +10,7 @@ QGCComboBox {
     property Fact fact: Fact { }
     property bool indexModel: true  ///< true: model must be specifed, selected index is fact value, false: use enum meta data
 
-    model: fact.enumStrings
+    model: fact ? fact.enumStrings : null
 
     currentIndex: indexModel ? fact.value : fact.enumIndex