Custom image browser - insertHTML not working

Hello all,

I have integrated CKeditor in my own CMS (PHP based) and I have now added a plug-in that browses a list of images. The idea was to be able to insert images back in the editor but each time I use the insertHTML instruction, my script stops.

Here is my setup for more information.

Inside plugin.js

CKEDITOR.plugins.add('imagebrowser', {
  "init": function(editor) {

    var pluginName = 'imagebrowser';
    editor.ui.addButton('imagebrowser', {
      label: 'Image browser',
      command: pluginName,
      click: function(editor) {
        var postData = 'form_type=list&page_type=photo&procedure=load_form&object_id=&referrer=ckeditor';
        $.ajax({
          type: 'POST',
          url: 'php/sl.php',
          data: postData,
          cache: false,
          async: false,
          dataType: 'html',
          success: function(result) {
            ManageLayer('list_content');
            $('#list_content').html(result);
          },
          error: function(XMLHttpRequest, textStatus, errorThrown) {
            alert(XMLHttpRequest.status);
            alert(XMLHttpRequest.responseText);
            $('#indicator').css("display", "none");
          },
        });

      }
    });

  }
});

This scripts call a php file with some parameters to display my list of image. Up to here, everything works as expected.

The CKeditor itself is inserted in the following textarea: (also working fine)

<textarea id="page_article"></textarea>

in my Image browser page, I have buttons attached to each picture, clicking on the button triggers the following code:
var editor = CKEDITOR.instances['page_article'];
editor.insertHtml('some html');

The html is never inserted in the editor and if I look at my javascript console, I get the following error message:
TypeError: w is undefined
ckeditor.js line 359 col 52

I have checked if the editor instance is working:
if (editor) { alert('ok'); }
I get "ok" but the code stops at the insertHtml line.

I'm completely stuck and I don't see what is the problem.

Any idea?

Thanks
Laurent