Fatal error: Call to undefined function is_plugin_active() | WordPress

There are some threads on the internet telling you to do this as a fix:

function check_some_other_plugin() {
if ( is_plugin_active('some-plugin.php') ) {
add_action( 'admin_init', 'check_some_other_plugin' );

That solution didn’t do anything for me, all I had to do was include plugin.php on my file like this:


And the error was gone. Hope this helps!

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