diff --git a/core/modules/widgets/widget.js b/core/modules/widgets/widget.js
index c04f1bf96..2c09641b0 100755
--- a/core/modules/widgets/widget.js
+++ b/core/modules/widgets/widget.js
@@ -171,7 +171,7 @@ Widget.prototype.evaluateMacroModule = function(name,actualParams,defaultValue)
 		else for(var i=0; i<actualParams.length; ++i) {
 			args.push(actualParams[i].value);
 		}
-		return macro.run.apply(this,args).toString();
+		return (macro.run.apply(this,args) || "").toString();
 	} else {
 		return defaultValue;
 	}