Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 6972)
+++ /CKEditor/trunk/CHANGES.html	(revision 6973)
@@ -80,4 +80,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/188">#188</a> : [IE] Objects selection were making the toolbar inactive on some situations.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/5314">#5314</a> : The aria-selected attribute was not been removed when rich combo box list items were deselected.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/7749">#7749</a> : Small check introduced to avoid issues with custom data processors and the insertHtml function.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.ckeditor.com/ticket/7834">#7834</a> : Dutch;</li>
Index: /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 6972)
+++ /CKEditor/trunk/_source/plugins/wysiwygarea/plugin.js	(revision 6973)
@@ -51,4 +51,7 @@
 		if ( this.dataProcessor )
 			data = this.dataProcessor.toHtml( data );
+
+		if ( !data )
+			return;
 
 		// HTML insertion only considers the first range.