Fatal Error in WordPress Blog - Help Needed ASAP

Fatal error: Call to a member function on a non-object in /home/tbeta/public_html/wp-includes/query.php on line 10

Code (markup):

I have kept getting that since a few days now. As far as I know, I've not altered any code, and infact, haven't touched the installation.

First, I thought it was the theme, so I changed it, then its happening again.

Here are the lines:

<?php

/*
 * The Big Query.
 */

function get_query_var($var) {
	global $wp_query;

[B]	return $wp_query->get($var);[/B]
}

function &query_posts($query) {
	unset($GLOBALS['wp_query']);
	$GLOBALS['wp_query'] =& new WP_Query();
	return $GLOBALS['wp_query']->query($query);
}

Code (markup):

I have bolded Line 10. This happened to a test installation as well. As soon as I imported the old database, this error re-occured.

Thanks
Santosh

 

Most of the time, this is due to a plugin conflict. Have you installed any plugins recently?
If so, disable them one at a time until the error goes away.