CRM_Contact_BAO_Contact::getcontactTypes returns subtype bounded by "\x01" delimeters

My profiles suddenly became unusable, displaying the message from line 429 of CRM/Profile/Form.php: "This profile is configured for contact type '%1'. It cannot be used to edit contacts of other types."

Debugging revealed that the contactSubType being returned from CRM_Contact_BAO_Contact::getcontactTypes had an additional character "\x01" added to the beginning and the end of the string.

I have made the following change to my installation to work around the problem, but I'm sure the correct fix lies elsewhere:

diff --git a/CRM/Contact/BAO/Contact.php b/CRM/Contact/BAO/Contact.php
index 5ab70ae..24dbbe6 100644
— a/CRM/Contact/BAO/Contact.php
+++ b/CRM/Contact/BAO/Contact.php
@@ -1076,7 +1076,7 @@ WHERE id={$id}; ";
if ($contact)

{ return array( $contact->contact_type, - $contact->contact_sub_type, + strtr($contact->contact_sub_type, array("\x01" => '')), ); }

else {