Notice: is_feed was called incorrectly

The answer is pretty simple: WPMinify class is started at the bottom of the file and the constructor uses is_feed() query function but at that point the query isn’t set yet so is_feed() will always return false even if opened page is actually a feed page.

One solution would be to start the class on init, by then, global variable $wp_query is set. Didn’t fully tested this, might prevent some functionality although I don’t see any reason why it should.

Steps:

1. edit wp-minify.php, scroll all the way to the bottom of the file.
2. look for $wp_minify = new WPMinify();
3. change the line with:

function wpmin_start(){
	global $wp_minify;
	$wp_minify = new WPMinify();
}
add_action('init', 'wpmin_start');

Hope this helps and works without breaking anything. Again, didn’t fully tested it, I suggest you do it and make sure everything is OK.

Hi Constantin,

thanks for responding!, after adding/changing the code with your suggestion the “Scream” is gone but it seems that following code is cause for the notice? (Shown by Debug Bar plugin)

NOTICE: \wp-content\plugins\wp-minify\wp-minify.php:696 - Undefined variable: src_match

The Notice appears as soon one/several .css files where add into the box below:
External CSS files to include into minify. (Only useful if “Minification on external files” is unchecked

Maybe this information helps a little more to find a workaround.

Thanks in advance for effort.

ps, the notice as mentioned (line 696)also appears after putting wp-minify.php back in original state.

I think, not sure though, that instead of $src_match on line 696 should be $href_match meaning that instead of this:

696. if (strlen($include_pat) > 0 && strpos($src_match[1], $include_pat) !== false) {

should be this:

696. if (strlen($include_pat) > 0 && strpos($href_match[1], $include_pat) !== false) {

Not 100% sure though, there’s a lot of code in there and I really don’t have the time to check all of it to understand its logic. I ended here yesterday only because a user of my plugin had some trouble while using wp-minify, not sure why yet but still investigating.

I strongly suggest you contact the author, maybe make a donation (plugin development can take an incredible amount of time), I’m sure he would be of much more help than I am.