0 Call to a member function purgePrivate() on null

Question

I just tried to login and I got this error message that I've never seen before.

0 Call to a member function purgePrivate() on null

I'm not sure what would have caused it.

It's PHP 7.3.

Interestingly I was on PHP7.4 but the redirect system didn't work so only my homepage showed.

Answer 1

This is from Litespeed Cache. It is somehow related to the Joomla Login. You can test this is true by uninstalling the Litespeed Cache plugin.

I went into cPanel and I went to Terminal and I did a search by copying and pasting this (right click to paste)

grep -Ri purgeprivate public_html

and it found:

$this->plugin->lscInstance->purgePrivate("com_virtuemart.cart");

Problem found. Solution awaiting. Raised on GitHub here:

https://github.com/litespeedtech/lscache-joomla/issues/42

Answer 2

Open lscache.php file it's in the folder httpdocs/plugins/system/lscache Comment on this Line 549

public function onUserAfterLogin($options) {
    if (!$this->cacheEnabled) {
        return;
    }

    if ($this->app->isAdmin()) {
        return;
    }
    $this->lscInstance->checkPrivateCookie();
    $this->checkVary();
    if ($this->esiEnabled) {
        $this->lscInstance->purgeAllPrivate();
        $this->log();
    }
}

public function onUserAfterLogout($options) {
    if (!$this->cacheEnabled) {
        return;
    }

    if ($this->app->isAdmin()) {
        return;
    }
    $this->checkVary();
    if ($this->esiEnabled) {
        $this->lscInstance->purgeAllPrivate();
        $this->log();
    }
}

public function onUserLoginFailure($respond) {
    $this->lscInstance->purgePrivate('joomla.login');
    $this->log();
}

Then try to login After that, uninstall LiteSpeed Cache Plugin.