diff --git a/src/document/UBDocumentController.cpp b/src/document/UBDocumentController.cpp
index 96650d07..7f7bf5a3 100644
--- a/src/document/UBDocumentController.cpp
+++ b/src/document/UBDocumentController.cpp
@@ -122,6 +122,9 @@ UBDocumentProxyTreeItem* UBDocumentController::findDocument(UBDocumentProxy* pro
 
 void UBDocumentController::selectDocument(UBDocumentProxy* proxy, bool setAsCurrentDocument)
 {
+    if (!proxy)
+        return;
+
     QTreeWidgetItemIterator it(mDocumentUI->documentTreeWidget);
 
     mDocumentUI->documentTreeWidget->clearSelection();