PHP fatal error

[John Lester]

This pops up in my error logs every once in awhile. I've not had any complaints about anything specific not working, nor have I been online when the error occurs.

vB.com wanted me to open a ticket and disable/uninstall all mods and upload a clean vB. I don't really want to do that since a lot of my members have neurological disorders and can't cope with change well (all the back n forth breaks some of the mods they use).

PHP Fatal error: Call to undefined function fetch_phrase() in /home2/nonyabiz/public_html/includes/functions.php on line 3518

Here's lines 3468 to 3529 (in case any of the preceding code is relevant) with 3518 in red.

// #############################################################################
/**
* Fetches an error phrase from the database and inserts values for its embedded variables
*
* @param	string	Varname of error phrase
* @param	mixed	Value of 1st variable
* @param	mixed	Value of 2nd variable
* @param	mixed	Value of Nth variable
*
* @return	string	The parsed phrase text
*/
function fetch_error()
{
	global $vbulletin;

	$args = func_get_args();

	// Allow an array of phrase and variables to be passed in as arg0 (for some internal functions)
	if (is_array($args[0]))
	{
		$args = $args[0];
	}

	if (class_exists('vBulletinHook', false))
	{
		($hook = vBulletinHook::fetch_hook('error_fetch')) ? eval($hook) : false;
	}

	if (!function_exists('fetch_phrase') AND !VB_API)
	{
		require_once(DIR . '/includes/functions_misc.php');
	}

	if ($vbulletin->GPC['ajax'])
	{
		switch ($args[0])
		{
			case 'invalidid':
			case 'nopermission_loggedin':
			case 'forumpasswordmissing':
				$args[0] = $args[0] . '_ajax';
		}
	}

	// API only needs error phrase name and args.
	if (defined('VB_API') AND VB_API === true)
	{
		return $args;
	}

	$args[0] = fetch_phrase($args[0], 'error', '', false);
	if (sizeof($args) > 1)
	{
		return call_user_func_array('construct_phrase', $args);
	}
	else
	{
		return $args[0];
	}
}

// #############################################################################