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The full contents of the error message I am getting:

ErrorException [ Error ]: Call to a member function implode_pk() on a non-object
PKGPATH/orm/classes/model.php @ line 730

This is happening when trying to associate a new "Product" with a "Category".
If I don't add a category, I don't get the error message. The Category:

protected static $_has_many = array(
        'products' => array(
            'key_from' => 'category',
            'model_to' => 'Uploader\Model_Offer',
            'key_to' => 'category',
            'cascade_save' => true,
            'cascade_delete' => false,
        )
    );

The Product:

protected static $_belongs_to = array(
        'category' => array(
            'key_from' => 'category',
            'model_to' => 'Uploader\Model_Category',
            'key_to' => 'category',
            'cascade_save' => true,
            'cascade_delete' => false,
        )
    );

It sort of came out of nowhere and the only backtrace is COREPATH/bootstrap.php @ line 36. I'm trying to figure out what changed in this module, but I'm struggling to do so. Any ideas?