Let's see what body>.desktop elements are there when the #boardNavDesktop is null

src/General/Header.coffee

@@ -100,6 +100,12 @@ Header =
         innerHTML: '<a href=javascript:;> - </a>'
       $.on btn, 'click', Header.toggleBoardList
       $.add fullBoardList, btn
+    else
+      Main.logError
+        message: "Header crash: nav is null"
+        error: new Error """
+        #{$$('body > .desktop').map((el) -> el.id).join ','}
+        """
 
     Header.setCustomNav      Conf['Custom Board Navigation']
     Header.generateBoardList Conf['boardnav']