diff --git a/lib/ace/editor.js b/lib/ace/editor.js
index a8efe242..e6d30eca 100644
--- a/lib/ace/editor.js
+++ b/lib/ace/editor.js
@@ -397,6 +397,9 @@ var Editor = function(renderer, session) {
      * Emitted once the editor comes into focus.
      **/
     this.onFocus = function() {
+        if (this.$isFocused)
+            return;
+        this.$isFocused = true;
         this.renderer.showCursor();
         this.renderer.visualizeFocus();
         this._emit("focus");
@@ -408,6 +411,9 @@ var Editor = function(renderer, session) {
      * Emitted once the editor has been blurred.
      **/
     this.onBlur = function() {
+        if (!this.$isFocused)
+            return;
+        this.$isFocused = false;
         this.renderer.hideCursor();
         this.renderer.visualizeBlur();
         this._emit("blur");