Header Menu Showing as Links

I accidentally click on activate a theme when I had a child them. Now when I go back and reactivate to the child them, the menu header is not displaying correctly but rather with live text. I get this error

Trying to get property ‘name’ of non-object in /../public_html/wp-admin/nav-menus.php on line 990
(Currently set to: )

Under appearance>menu

Please help.

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