Undefined index: node in entityreference_view_widget_field_widget_form

First thank you very much for this awesome widget! :)

I just came across this notice:

Notice: Undefined index: node in entityreference_view_widget_field_widget_form() (line 298 of entityreference_view_widget.module).

This is caused by the fact that node_view_multiple() stores the entities to return in an array with the keyed by "nodes" instead "node" ($build['nodes']).
Thus we can't access these by using the entity type - current code in entityreference_view_widget_field_widget_form() :

$entity_view = $entity_view[$entity_type];

I'm not sure if reset($entity_view) would be an appropriate way of accessing the results :|
Is there any chance that there are multiple keys?

Attention: It could be that this issue is a side effect of using this patch #1266036: Add generic Views entity tables with fields and relationships