Tinymce and j is null using tinyMCE.execCommand('mceRemoveControl', false, "textarea_id");

I am using TinyMCE on my website, and keep running into the error:

j is null

I am loading a file via ajax, which contains a textarea. I then perform:

tinyMCE.execCommand('mceAddControl', false, 'id');

Before I call TinyMCE again, I use:

tinyMCE.execCommand('mceRemoveControl', false, 'id');

However, this results in the j is null error.

I have broken down tinymce.js into lines, and j is within the class selection. More specifically, inside the getRng function, as documented here:

http://tinymce.moxiecode.com/js/tinymce开发者_开发百科/docs/api/index.html#class_tinymce.dom.Selection.html

My guess is that there is still something in the browser memory stack after the control is removed? Either way, I could really use a solution to the problem.

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If the problem occurs sporadically, perhaps you are not listening to TinyMCE events like oninit, etc. to ensure that it's ready when you are performing actions on it.