Hi,
Did you have any update available for K-elements or visual composer under wp-admin -> appearance -> install plugins ? If yes do the update/s.
If no de-activate K-elements and visual composer from wp-admin-> plugins then delete them, then go back to wp-admin -> appearance -> install plugins and install them.
If still not works try to de-activate child theme and rest of the plugins then check again, if it works enable all back one by one while you check until you find the plugin that causes that.
Let me know
Cheers
R
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