Error while edit my nav

i tryed to edit my nav in the menu page.

I already had the menu translated. But when i try to change some spelling & grammar errors i got from my colleague. it gave me the following error:

“Fatal error: Cannot unset string offsets in *************/public_html/test/wp-content/plugins/qtranslate-x/admin/qtx_admin.php on line 27”

Anyone that can help me?

https://wordpress.org/plugins/qtranslate-x/