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How to fix fatal error: Call to undefined function is_network_admin() in WordPress

Fatal error: Call to undefined function is_network_admin()

Wow, that sounds bad! Well, don’t worry, it’s not as bad as you think it is.

This occurs when you update your WordPress, and you try to log in.

The error will look something like this,

Fatal error undefined function is_network_admin()

This is one of those frustrating errors where you’re absolutely at no fault.

In this article, you’ll learn how to fix the Fatal error: Call to undefined function is_network_admin() in WordPress.

Why does this error occur?

A failed WordPress update causes this error to occur. Sometimes the WordPress Auto Update fails because of a corrupt update.

How to fix Fatal error: Call to undefined function is_network_admin() in WordPress

You’ll have to fix this error via an FTP client. We have used Filezilla in this demo.

Fixing Fatal error: Call to undefined function is_network_admin() in WordPress via FTP

I’ll be showing you how to fix this issue using Filezilla.

Step 1: Download and unzip the latest WordPress version.

Fatal error undefined function is_network_admin()

 

Step 2: Backup all your WordPress files to avoid loss of data.

 

Step 3: Now, rename the wp-admin and wp-includes directories to wp-admin.bak and wp-includes.bak through Filezilla.

 

Step 4: After backing up, you need to upload the wp-includes and wp-admin directories. You’ll find these files in the unzipped folder on your desktop and upload them to your web host via FTP (Filezilla).

 

upload files

 

Step 5: Now, you’ll have to upload your files from the new wp-content folder to your old wp-content folder.

 

upload files to new wp-content

 

Step 6: Replace and overwrite the existing files.

Replace files

 

Step 7: After replacing the files, go to WordPress root directory and upload the new version of the remaining files.

 

Step 8: Remove the .maintenance file from the WordPress root directory.
delete .maintenance file

 

Step 9: You’re almost done, log into your WordPress admin area and follow the link that you’re given. Just follow the instructions that appear on the screen.

 

Final Step: If you’ve enabled caching then clear your cache data and then log in, your site should work perfectly without any errors.

 

We hope that the above method has fixed the Fatal error: Call to undefined function is_network_admin() in WordPress for you. If you know any other method, please share with us in the comment section.
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