Merge pull request #2310 from jspantheonlab/bugfix/canvasRendererDestroyNoWrapper

validation check on if wrapper exist
diff --git a/player/js/renderers/CanvasRenderer.js b/player/js/renderers/CanvasRenderer.js
index 29a4f61..d936e64 100644
--- a/player/js/renderers/CanvasRenderer.js
+++ b/player/js/renderers/CanvasRenderer.js
@@ -248,7 +248,7 @@
 };
 
 CanvasRenderer.prototype.destroy = function () {
-    if(this.renderConfig.clearCanvas) {
+    if(this.renderConfig.clearCanvas && this.animationItem.wrapper) {
         this.animationItem.wrapper.innerText = '';
     }
     var i, len = this.layers ? this.layers.length : 0;