Ajax error while manual processing "Upload context" queue

Issue

When you process the upload context queue from connector settings page and there is different user set up as a context user then only first item in a queue will be processed. After first item you will see a message:

An AJAX HTTP error occurred.
HTTP Result Code: 200
Debugging information follows.
Path: /batch?id=31&op=do_nojs&op=do
StatusText: OK
ResponseText: 
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