Node export features calls content_types(), but does not depend on CCK/content module

If you have the Node export features sub-module enabled and you try to export nodes, you get the following PHP fatal error which terminates page execution before anything is output:

Fatal error: Call to undefined function content_types() in /home/mattp/Sites/qa/sites/all/modules/node_export/modules/node_export_features/node_export_features.module on line 162