invalid $node passed to taxonomy functions -- was: invalid argument

I too am receiving this same warning message when running Cron manually. I am working off of 5.7.

Any help would be muchly appreciated.

I get a similar warning when loading blog/feed:

Invalid argument supplied for foreach() in /var/www/drupal-5.7/modules/taxonomy/taxonomy.module on line 1453

This is occurring at a different line of taxonomy.module from adkatrit's message, but at each point the code is the same:
foreach ($node->taxonomy as $term)

The warning implies that $node->taxonomy is either null or not an array. In my case this invalid $node is being passed to taxonomy_rss_item, and in adkatrit's case it is being passed into the function taxonomy_node_update_index.

Similar reports have occurred before, #62745: missing is_array in taxonomy_rss_item and #90850: "invalid argument" check for taxonomy_rss_item(). On both of these threads, it is suggested to use is_array($node) or isset($node->taxonomy) to check that the argument is valid.

But on #62745: missing is_array in taxonomy_rss_item, Dries comments:

I think $node->taxonomy is always supposed to be an array. Needs more investigation.

Any help or suggestions for where to look for the problem would be appreciated.

Considering the time elapsed between now and the last comment plus the fact that D5 is no longer supported, I am closing this ticket.