NullPointerException returned when changing VPN Customer Gateway settings

[shoekstra]

When trying to modify an existing VPN Customer Gateway via the API NullPointerException: is returned:

$ cloudmonkey list vpncustomergateways id=cc9942b9-e953-4f2b-88e6-05467b6c1075
count = 1
vpncustomergateway:
name = terraform-foo
id = cc9942b9-e953-4f2b-88e6-05467b6c1075
account = ...
cidrlist = 10.0.1.0/24
domain = SBP
domainid = f7842270-6097-45af-ad1e-a678e06d0f22
dpd = False
esplifetime = 86400
esppolicy = aes256-sha1
forceencap = False
gateway = 1.2.3.4
ikelifetime = 86400
ikepolicy = aes256-sha1;modp1024
ipsecpsk = test


$ cloudmonkey update vpncustomergateway id=cc9942b9-e953-4f2b-88e6-05467b6c1075 cidrlist=10.0.1.0/24 gateway=1.2.3.4 esppolicy=aes256-sha1 ikepolicy='aes256-sha1;modp2048' ipsecpsk=test
Async job 35181e0a-e1b8-43b3-9204-79952c79cc4c failed
Error 530, NullPointerException:
accountid = 1ac7a8ae-c639-4f8c-b934-a01e23be7cab
cmd = com.cloud.api.command.user.vpn.UpdateVpnCustomerGatewayCmd
created = 2019-02-24T16:18:13+0100
jobid = 35181e0a-e1b8-43b3-9204-79952c79cc4c
jobprocstatus = 0
jobresult:
errorcode = 530
errortext = NullPointerException:
jobresultcode = 530
jobresulttype = object
jobstatus = 2
userid = 1fac3ec1-0ae7-40d7-85b5-83d073c77aac

Can't replicate this when modifying properties of the VPN Customer Gateway via the UI, after saving and refreshing the new settings are visible (and returned correctly via the API).