diff --git a/core/modules/widgets/blockmark.js b/core/modules/widgets/blockmark.js
index 833e5227c..75b08d3a0 100644
--- a/core/modules/widgets/blockmark.js
+++ b/core/modules/widgets/blockmark.js
@@ -3,7 +3,7 @@ title: $:/core/modules/widgets/block-mark.js
 type: application/javascript
 module-type: widget
 
-An invisible element with block mark id metadata. Marking a block level element, so that it can be jumped to.
+An invisible element with block mark id metadata. Marking a block level element, so that it can be jumped to or transcluded.
 \*/
 var Widget = require("$:/core/modules/widgets/widget.js").widget;
 var BlockMarkWidget = function(parseTreeNode,options) {
@@ -21,9 +21,13 @@ BlockMarkWidget.prototype.render = function(parent,nextSibling) {
 	// Create an invisible DOM element with data that can be accessed from JS or CSS
 	this.idNode = this.document.createElement("span");
 	this.idNode.setAttribute("data-block-mark-id",this.blockMarkId);
-	this.idNode.setAttribute("data-block-mark-title",this.tiddlerTitle);
-	// id for anchor jumping in static site
-	this.idNode.setAttribute("id",this.tiddlerTitle + "-" + this.blockMarkId);
+	if(this.tiddlerTitle) {
+		this.idNode.setAttribute("data-block-mark-title",this.tiddlerTitle);
+		// id for anchor jumping in static site
+		this.idNode.setAttribute("id",this.tiddlerTitle + "-" + this.blockMarkId);
+	} else {
+		this.idNode.setAttribute("id",this.blockMarkId);
+	}
 	// if the actual block is before this node, we need to add a flag to the node
 	if(this.previousSibling) {
 		this.idNode.setAttribute("data-block-mark-previous-sibling","true");
@@ -39,7 +43,7 @@ Compute the internal state of the widget
 BlockMarkWidget.prototype.execute = function() {
 	// Get the id from the parse tree node or manually assigned attributes
 	this.blockMarkId = this.getAttribute("id");
-	this.tiddlerTitle = this.getVariable("currentTiddler");
+	this.tiddlerTitle = this.getVariable("currentTiddler", "");
 	this.previousSibling = this.getAttribute("previousSibling") === "yes";
 	// Make the child widgets
 	this.makeChildWidgets();