NPE when creating relationships between entities with spaces in names

I created two collections called "/cities" and "/countries", and inserted one entity into each. For "/countries"

{
action: "post"
application: "c1518d80-44ba-11e3-83f9-1beebcb01927"
params: {}
path: "/countries"
uri: "https://api.usergrid.com/fdsafdsa/sandbox/countries"
entities: [1]
0: {
uuid: "7bf9c760-44c5-11e3-9437-393fabf0b04e"
type: "country"
name: "Andorra"
created: 1383510073045
modified: 1383510073045
area: 468
capitol: "Andorra la Vella"
continent: "EU"
currency: "EUR"
currencyName: "Euro"
fips: "AN"
iso3CountryCode: "AND"
isoCountryCode: "AD"
isoNumeric: "020"
languages: "ES,FR"
metadata: {
path: "/countries/7bf9c760-44c5-11e3-9437-393fabf0b04e"
}-
population: 84000
tld: ".ad"
}-
-
timestamp: 1383510073040
duration: 127
organization: "fdsafdsa"
applicationName: "sandbox"
}

For "/cities":

{
action: "post"
application: "c1518d80-44ba-11e3-83f9-1beebcb01927"
params: {}
path: "/cities"
uri: "https://api.usergrid.com/fdsafdsa/sandbox/cities"
entities: [1]
0: {
uuid: "01efcefa-44cb-11e3-89e9-fdf51fd9e7b3"
type: "city"
name: "lesEscaldes"
created: 1383512445279
modified: 1383512445279
alternateNames: "Ehskal'des-Ehndzhordani,Escaldes,Escaldes-Engordany,Les Escaldes,esukarudesu=engorudani jiao qu,lai sai si ka er de-en ge er da,Эскальдес-Энджордани,エスカルデス＝エンゴルダニ教区,萊塞斯卡爾德-恩戈爾達,萊塞斯卡爾德－恩戈爾達"
asciiName: "les Escaldes"
cc2: "08"
countryCode: "AD"
featureClass: "P"
featureCode: "PPLA"
geonameId: 3040051
location: {
latitude: 42.50729
longitude: 1.53414
}-
metadata: {
path: "/cities/01efcefa-44cb-11e3-89e9-fdf51fd9e7b3"
}-
population: 15853
timeZone: "Europe/Andorra"
}-
-
timestamp: 1383512445274
duration: 96
organization: "fdsafdsa"
applicationName: "sandbox"
}

I then tried to create a "contains" relationship using:

POST https://api.usergrid.com/fdsafdsa/sandbox/countries/Andorra/contains/cities/les Escaldes

I got a 400 Bad Request back with the following payload:

{
error: "null_pointer"
timestamp: 1383513044711
duration: 0
exception: "java.lang.NullPointerException"
}

The request works if I use the UUIDs or if I change the "les Escaldes" entry to not have a space in the name.