diff --git a/lib/ice-coder.js b/lib/ice-coder.js
index 3b4cb35..1b28778 100644
--- a/lib/ice-coder.js
+++ b/lib/ice-coder.js
@@ -728,6 +728,12 @@ var ICEcoder = {
 	// Show Function & class params tooltip
 	functionClassParamsTooltip: function(e, area) {
 	    if (top.ICEcoder.indexData) {
+		// If we have no files open, return early
+                if (top.ICEcoder.openFiles.length === 0) {
+                    get('tooltip').style.display = "none";
+                    return true;
+                }
+		    
             	var i;
                 // Get cM instance, and the word under mouse pointer
                 var cM = top.ICEcoder.getcMInstance();