Warning: Invalid argument supplied for foreach() in /wp-includes/canonical.php

If i change the canonical.php script by replacing this section line 53:

foreach ( $wp_query->tax_query as $tax_query )
    $term_count += count( $tax_query['terms'] );

by this code:

if (is_tax()) {
   foreach ( $wp_query->tax_query as $tax_query )
     $term_count += count( $tax_query['terms'] );
}

The problem is solved…

Mmhh, did not solve all the issue a better patch will be:

replace:

foreach ( $wp_query->tax_query as $tax_query )
    $term_count += count( $tax_query['terms'] );

by:

foreach ( (array) $wp_query->tax_query as $tax_query )
    $term_count += count( $tax_query['terms'] )

It works now when i try todisplay my category:

http://blog.nicolargo.com/category/open-source

But when i try to get the feed for that category (http://blog.nicolargo.com/category/open-source/feed), i have the following error on the XML file:

<b>Warning</b>: Invalid argument supplied for foreach() in <b>/srv/d_bilbo/web/blog/wp-includes/canonical.php</b> on line <b>153</b>

…