The error occurs after importing xml file

Hi, Support team.
After I import the content.xml file, the website encounters the following error:

Notice: Trying to get property of non-object in /home/hailight/public_html/wp-includes/link-template.php on line 317
Notice: Trying to get property of non-object in /home/hailight/public_html/wp-includes/link-template.php on line 355
Notice: Trying to get property of non-object in /home/hailight/public_html/wp-includes/link-template.php on line 367
Notice: Trying to get property of non-object in /home/hailight/public_html/wp-includes/link-template.php on line 378
Notice: Trying to get property of non-object in /home/hailight/public_html/wp-includes/link-template.php on line 331
Can you help me fixed this issue?
My site: https://hailightsvietnam.com/
Thanks.