diff --git a/js/main.js b/js/main.js
index 9ee3f789..37c04782 100644
--- a/js/main.js
+++ b/js/main.js
@@ -246,6 +246,8 @@ var MM = (function() {
 				if (typeof callback === "function") { callback(); }
 			}, speed);
 		}
+		else  // invoke callback even if no content, issue 1308
+			if (typeof callback === "function") { callback(); }
 	};
 
 	/* showModule(module, speed, callback)