fatal error - while running cron on specific feed

about simplepie.inc - i still think it's different than:
http://svn.simplepie.org/simplepie/trunk/simplepie.inc

i started a new database (clean site),
i edit php.ini - and adjust memory from 24M to 124M

not getting the serialize() error anymore,
but now i get infinite (i guess in the amount of items of the feed) of the following error messages -

( ! ) Warning: Got a packet bigger than 'max_allowed_packet' bytes query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Got a packet bigger than 'max_allowed_packet' bytes\nquery: INSERT INTO simplefeed_feed_item_cache (data, fid) VALUES ('O:14:\\"SimplePie_Item\\":9:{s:4:\\"feed\\";O:9:\\"SimplePie\\":26:{s:4:\\"data\\";a:7:{s:6:\\"attibs\\";a:1:{s:32:\\"HTTP://BACKEND.USERLAND.COM/RSS2\\";a:1:{s:7:\\"VERSION\\";s:3:\\"2.0\\";}}s:8:\\"xml_lang\\";s:0:\\"\\";s:5:\\"child\\";a:1:{s:32:\\"HTTP://BACKEND.USERLAND.COM/RSS2\\";a:1:{s:7:\\"CHANNEL\\";a:1:{ in /usr/lampp/htdocs/includes/database.mysql.inc on line 167
Call Stack
# Time Function Location
1 0.0002 {main}() /usr/lampp/htdocs/cron.php:0
2 0.1781 drupal_cron_run() /usr/lampp/htdocs/cron.php:11
3 0.1798 module_invoke_all() /usr/lampp/htdocs/includes/common.inc:2010
4 0.2044 call_user_func_array () /usr/lampp/htdocs/includes/module.inc:406
5 0.2044 simplefeed_item_cron() /usr/lampp/htdocs/includes/module.inc:0
6 10.7901 db_query() /usr/lampp/htdocs/sites/fp4.unchaos.org/modules/simplefeed/simplefeed_item.module:330
7 10.8176 _db_query() /usr/lampp/htdocs/includes/database.inc:200
8 10.8624 trigger_error () /usr/lampp/htdocs/includes/database.mysql.inc:167
9 10.8689 error_handler() /usr/lampp/htdocs/includes/common.inc:0
10 10.9534 watchdog() /usr/lampp/htdocs/includes/common.inc:555
11 10.9535 db_query() /usr/lampp/htdocs/includes/bootstrap.inc:635
12 10.9875 _db_query() /usr/lampp/htdocs/includes/database.inc:200
13 11.0507 trigger_error () /usr/lampp/htdocs/includes/database.mysql.inc:167

( ! ) Warning: Got a packet bigger than 'max_allowed_packet' bytes query: INSERT INTO watchdog (uid, type, message, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', 'Got a packet bigger than 'max_allowed_packet' bytes\nquery: INSERT INTO simplefeed_feed_item_cache (data, fid) VALUES ('O:14:\\"SimplePie_Item\\":9:{s:4:\\"feed\\";O:9:\\"SimplePie\\":26:{s:4:\\"data\\";a:7:{s:6:\\"attibs\\";a:1:{s:32:\\"HTTP://BACKEND.USERLAND.COM/RSS2\\";a:1:{s:7:\\"VERSION\\";s:3:\\"2.0\\";}}s:8:\\"xml_lang\\";s:0:\\"\\";s:5:\\"child\\";a:1:{s:32:\\"HTTP://BACKEND.USERLAND.COM/RSS2\\";a:1:{s:7:\\"CHANNEL\\";a:1:{ in /usr/lampp/htdocs/includes/database.mysql.inc on line 167
Call Stack
# Time Function Location
1 0.0002 {main}() /usr/lampp/htdocs/cron.php:0
2 0.1781 drupal_cron_run() /usr/lampp/htdocs/cron.php:11
3 0.1798 module_invoke_all() /usr/lampp/htdocs/includes/common.inc:2010
4 0.2044 call_user_func_array () /usr/lampp/htdocs/includes/module.inc:406
5 0.2044 simplefeed_item_cron() /usr/lampp/htdocs/includes/module.inc:0
6 13.6662 db_query() /usr/lampp/htdocs/sites/fp4.unchaos.org/modules/simplefeed/simplefeed_item.module:330
7 13.6937 _db_query() /usr/lampp/htdocs/includes/database.inc:200
8 13.7369 trigger_error () /usr/lampp/htdocs/includes/database.mysql.inc:167
9 13.7434 error_handler() /usr/lampp/htdocs/includes/common.inc:0
10 13.8278 watchdog() /usr/lampp/htdocs/includes/common.inc:555
11 13.8279 db_query() /usr/lampp/htdocs/includes/bootstrap.inc:635
12 13.8622 _db_query() /usr/lampp/htdocs/includes/database.inc:200
13 13.9270 trigger_error () /usr/lampp/htdocs/includes/database.mysql.inc:167

.
.
.
etc.

oh, btw - all these errors appears when i'm trying to run cron.php

the only way i did get it to work -

i replaced this:

db_query("INSERT INTO {simplefeed_feed_item_cache} (data, fid) VALUES (%b, %d)", serialize($item), $process_feed->nid);

with this:

    $node = array('type' => 'feed_item');                                           
    $values['title'] = $item->get_title();
    $values['created'] = strtotime($item->get_date());
    $values['format'] = variable_get('simplefeed_format', 1);
    $values['body'] = $item->get_content();            
    $values['expires'] = $item->feed_expires;
    $values['url'] = $item->get_permalink();                                                                                
    $values['fid'] = $feed_item->fid;
    $values['taxonomy'] = $item->taxonomy;                     

    // create a new feed-item node, adding in all of the other node defaults
    drupal_execute('feed_item_node_form', $values, $node);

seems like something in the cache stuff - created these errors