diff --git a/core-overlay.html b/core-overlay.html
index 2c7c3d8..8060c24 100644
--- a/core-overlay.html
+++ b/core-overlay.html
@@ -454,7 +454,7 @@ <h2>Dialog</h2>
     completeBackdrop: function() {
       if (this.backdrop) {
         trackBackdrop(this);
-        if (getBackdrops().length === 0) {
+        if (getBackdrops().length === 0 && this.scrim.parentNode) {
           this.scrim.parentNode.removeChild(this.scrim);
         }
       }