Undefined index: node in node_reference_field_formatter_view() when using node_save on nodes with _field_view_prepared flag

I get the following php notice errors:

Notice: Undefined index: node in node_reference_field_formatter_view() (line 441 of /path/to/install/sites/all/modules/references/node_reference/node_reference.module).

and

Notice: Trying to get property of non-object in node_reference_field_formatter_view() (line 457 of /path/to/install/sites/all/modules/references/node_reference/node_reference.module).

when attempting to node_save a node with the _field_view_prepared flag in it. I can shoehorn this into working by unsetting the _field_view_prepared flag manually before saving the node, but that can't be healthy.