X-Git-Url: https://jasonwoof.com/gitweb/?p=ckeditor.git;a=blobdiff_plain;f=plugins%2Fpreview%2Fpreview.html;fp=plugins%2Fpreview%2Fpreview.html;h=8c0282628d00b5c88e185f24dfbbe22f7c32a15c;hp=d6c4937c1c1d89e3f585596b2dca4b3d2f6eeaea;hb=05a92c756e4eb687b685576b323858b8517209c9;hpb=d3fb48f109f679b7874f1224df6268780e27b4cf

diff --git a/plugins/preview/preview.html b/plugins/preview/preview.html
index d6c4937..8c02826 100644
--- a/plugins/preview/preview.html
+++ b/plugins/preview/preview.html
@@ -1,10 +1,13 @@
 <script>
 
-var doc = document;
-doc.open();
-doc.write( window.opener._cke_htmlToLoad );
-doc.close();
+// Prevent from DOM clobbering.
+if ( typeof window.opener._cke_htmlToLoad == 'string' ) {
+	var doc = document;
+	doc.open();
+	doc.write( window.opener._cke_htmlToLoad );
+	doc.close();
 
-delete window.opener._cke_htmlToLoad;
+	delete window.opener._cke_htmlToLoad;
+}
 
 </script>