Today i saw in four of our builds this stack trace below. We use the multi job plugin to trigger some down stream builds. 4 of 5 show this error.

We use this environment:
Windows Server 2008 RC2
Jenkins Version 1.497
SVN Plugin Version: 1.44

Updating **RepositoryURL** to revision '2013-01-15T02:01:49.770 +0100'
At revision 10971
no change for **RepositoryURL** since the previous build
FATAL: null
java.lang.NullPointerException
at hudson.model.RunParameterValue.buildEnvVars(RunParameterValue.java:72)
at hudson.model.ParametersAction.buildEnvVars(ParametersAction.java:82)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:948)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:84)
at hudson.tasks.CommandInterpreter.perform(CommandInterpreter.java:60)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:810)
at hudson.model.Build$BuildExecution.build(Build.java:199)
at hudson.model.Build$BuildExecution.doRun(Build.java:160)
at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:592)
at hudson.model.Run.execute(Run.java:1543)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:236)