diff --git a/src/MiniDocs/Markdeep.class.st b/src/MiniDocs/Markdeep.class.st
index 6265359..1531adc 100644
--- a/src/MiniDocs/Markdeep.class.st
+++ b/src/MiniDocs/Markdeep.class.st
@@ -241,7 +241,7 @@ Markdeep >> metadataFromXML: aXMLDocument [
 
 { #category : #'instance creation' }
 Markdeep >> navTop [
-	^ navTop
+	^ navTop ifNil: [ navTop := '' ]
 ]
 
 { #category : #'as yet unclassified' }