'Node wont save if text field contains word "having"

When I try to save edited node Drupal just reset field values and do nothing without any error message or log.

I entered text word by word and found that word "having" cause such behavior.

I'm using ckeditor to edit and filter text value and I guess that this module source of problem. As if I save text as plain text there are no issues.

Right now I don't know what to do next to track, dig deeper and isolate this issue...

PS. In ckeditor format settings I checked only two options:

  1. Limit allowed HTML tags and correct faulty HTML
  2. Convert line breaks into HTML (i.e. br and p)


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