Since a few versions the xcode plugin no longer stores the profileId entry in the job config.xml file. This means that a working configuration suddenly stops working when I save it. The exception I am getting is:

ERROR: Build step failed with exception
java.lang.NullPointerException
at com.cloudbees.plugins.credentials.matchers.IdMatcher.<init>(IdMatcher.java:56)
at com.cloudbees.plugins.credentials.CredentialsMatchers.withId(CredentialsMatchers.java:132)
at au.com.rayh.DeveloperProfileLoader.getProfile(DeveloperProfileLoader.java:368)
at au.com.rayh.DeveloperProfileLoader.perform(DeveloperProfileLoader.java:152)
at au.com.rayh.DeveloperProfileLoader.perform(DeveloperProfileLoader.java:296)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
at hudson.model.Build$BuildExecution.build(Build.java:206)
at hudson.model.Build$BuildExecution.doRun(Build.java:163)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
at hudson.model.Run.execute(Run.java:1880)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:97)
at hudson.model.Executor.run(Executor.java:428)
Build step 'Import developer profile' marked build as failure