Admin Menu Editor Warning: reverse_item_lookup is empty!

Hello,

I have bought the pro version of the Plugin “Admin Menu Editor” and I have the error :

Admin Menu Editor
[resolved] Warning: reverse_item_lookup is empty!

I have seen an old thread which was about this error so I have followed the previous recommandation and disabled every plugin but I still have the error.
I also have a message in the JS console which says :
Input is null
In the following function :

function stripAllTags(input) {
	//Based on: http://phpjs.org/functions/strip_tags/
	var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>/gi,
		commentsAndPhpTags = /<!--[\s\S]*?-->|<\?(?:php)?[\s\S]*?\?>/gi;
	return input.replace(commentsAndPhpTags, '').replace(tags, '');
}

Do you have any idea ?

Thank you for your help !