MNET cannot resolve URI '0' when registerAllHosts is ON

When adding a new MNET Peer (let's call it MoodleB) where registerAllHosts is on, MoodleA gets a false result from mnet_get_public_key:
"Request for $uri returned unexpected result: 0, cannot resolve host '0'"
"cannot resolve host 0" is the exception response from MoodleB.

Turned off registerAllHosts, MoodleB correctly responses his public key.
The unexpected behaviour originates from a semantic coding error at mnet/xmlrpc/serverlib.php and the callback function mnet_keyswap. At line 533 it's wrong to use the php-function each($params).