Quikmail history does not show date in Moodle 2.6.10

In the overview of Quickmail block the date of the email is missing in the date column.

Moodle 2.6.10

Quickmail
// Written at Louisiana State University
$plugin->version = 2014042914;
$plugin->requires = 2013051400;
$plugin->release = "v1.5.0";