smart indexer error simpleimage.php, Undefined Variable

Hi,

You guys helped me with fixing index options in this thread:
http://stackideas.com/forums/smart-search-indexer-fails-with-unable-to-set-as-revision-as-current-revision-on-post

The indexer nicely runs to the end, but throws error an error:

Starting Indexer

Setting up Smart Search plugins

Setup 1070 items in 0.843 seconds.

 * Processed batch 1 in 13.12 seconds.

 * Processed batch 2 in 14.44 seconds.

 * Processed batch 3 in 10.376 seconds.

 * Processed batch 4 in 12.782 seconds.

 * Processed batch 5 in 11.259 seconds.

 * Processed batch 6 in 12.558 seconds.

 * Processed batch 7 in 12.22 seconds.

PHP Notice:  Undefined variable: resource in /home/vhosting/k/vhost0029082/domains/gillesen.nl/htdocs/nick/administrator/components/com_easyblog/includes/simpleimage/simpleimage.php on line 256



Notice: Undefined variable: resource in /home/vhosting/k/vhost0029082/domains/gillesen.nl/htdocs/nick/administrator/components/com_easyblog/includes/simpleimage/simpleimage.php on line 256

 * Processed batch 8 in 11.964 seconds.

 * Processed batch 9 in 8.607 seconds.

 * Processed batch 10 in 4.998 seconds.

 * Processed batch 11 in 5.093 seconds.

 * Processed batch 12 in 5.45 seconds.

 * Processed batch 13 in 5.406 seconds.

 * Processed batch 14 in 5.827 seconds.

 * Processed batch 15 in 4.957 seconds.

 * Processed batch 16 in 5.372 seconds.

 * Processed batch 17 in 5.328 seconds.

 * Processed batch 18 in 3.458 seconds.

 * Processed batch 19 in 0.475 seconds.

 * Processed batch 20 in 0.313 seconds.

 * Processed batch 21 in 0.476 seconds.

 * Processed batch 22 in 0.194 seconds.

Total Processing Time: 155.525 seconds.

It seems harmless, but I'd like to know why this happens.

Line 256 is:

        if ($this->type == IMAGETYPE_PNG) {



            $resource = imagecreatetruecolor($width, $height);

            $transparent = imagecolorallocatealpha($resource, 255, 255, 255, 127);



            imagealphablending($resource, false);

            imagesavealpha($resource, true);

            imagefilledrectangle($resource, 0, 0, $width, $height, $transparent);

            imagecopyresampled($resource, $this->resource, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());

    	}



        // Update with the new resource now

        $this->resource = $resource;

    }

Thank you,

Roel