Null Pointer Exception creating fabric container via SSH

Trying to create a container results in the following message:

Failed to create container: org.fusesource.fabric.api.FabricException: java.lang.NullPointerException

Going to the error log reveals this stack trace:

org.fusesource.fabric.api.FabricException: java.lang.NullPointerException
at org.fusesource.fabric.service.ssh.SshContainerProvider.create(SshContainerProvider.java:96)
at org.fusesource.fabric.service.ssh.SshContainerProvider.create(SshContainerProvider.java:46)
at org.fusesource.fabric.service.FabricServiceImpl.createContainers(FabricServiceImpl.java:258)
at com.fusesource.ide.fabric.navigator.Fabric$3.run(Fabric.java:396)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.NullPointerException
at java.lang.String.<init>(String.java:147)
at org.fusesource.fabric.service.ssh.SshContainerProvider.create(SshContainerProvider.java:73)
... 4 more