Trying to get property of non-object in filefield_field_sanitize() line 294 of filefield_field.inc

Should probably also note that this is with pressflow.

This seems to be a conflict with the Realname module. Disabling that module resolves the issue. Looking at backtrace shows that realname's implementation of content_profile_load_profile() cals

content_format($field_name, $content);

.

This looks like a valid way to call content_format() whose signature looks like so:

content_format($field, $item, $formatter_name = 'default', $node = NULL)

So, content_format then calls filefield_file_sanitze with a NULL node object (the following is from content_format):

    if (content_handle('formatter', 'multiple values', $formatter) == CONTENT_HANDLE_CORE) {
      // Single value formatter.

      // hook_field('sanitize') expects an array of items, so we build one.
      $items = array($item);
      $function = $field['module'] .'_field';
      if (function_exists($function)) {
        $function('sanitize', $node, $field, $items, FALSE, FALSE);
      }

      $element['#item'] = $items[0];
    }

$node is null because it wan't passed to content_format(). Should filefield_field_sanitize() be able to deal with a NULL node object, since content_format may pass one to it? Or, is content_format at fault here?

Here is a patch that gets rid of the warning by first checking if the node object is valid before trying to use it to set the nid property. I don't know if this would have any side effects, but it seems to be working for me.