Can't create workspace with Sencha Cmd v5.1.0.26

I can't get a workspace to generate when using a partial path with Sencha Cmd v5.1.0.26.

I was able to get it to work when I used a full path for the workspace path.

Works:

sencha -sdk ext-5.1.0-commercial generate workspace /home/myaccount/ext-highcharts

Fails:

sencha -sdk ext-5.1.0-commercial generate workspace ext-highcharts

sencha -sdk ext-5.1.0-commercial generate workspace ext-highcharts

Sencha Cmd v5.1.0.26

[ERR] java.lang.NullPointerException

at com.sencha.util.PathUtil.getAbsolutePath(PathUtil.java:212)

at com.sencha.command.generator.GeneratorCommands$WorkspaceCommand.getParameters(GeneratorCommands.java:107)

at com.sencha.command.BasePluginCommands$BasePluginCommand.doExecute(BasePluginCommands.java:82)

at com.sencha.command.generator.GeneratorCommands$WorkspaceCommand.execute(GeneratorCommands.java:100)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:606)

at com.sencha.util.MethodInvoker$Arguments.invoke(MethodInvoker.java:175)

at com.sencha.cli.Command.dispatch(Command.java:43)

at com.sencha.command.BasePluginCommands$BasePluginCommand.dispatch(BasePluginCommands.java:148)

at com.sencha.cli.Commands.dispatch(Commands.java:64)

at com.sencha.cli.Commands.dispatch(Commands.java:64)

at com.sencha.command.Sencha.dispatch(Sencha.java:72)

at com.sencha.command.Sencha.main(Sencha.java:140)

Can't create workspace with Sencha Cmd v5.1.0.26