After installing the latest version of Hudson we get sometimes the following Exception.

ERROR: Processing failed due to a bug in the code. Please report this to users@hudson.dev.java.net
java.lang.UnsupportedOperationException
at java.util.AbstractMap$SimpleImmutableEntry.setValue(AbstractMap.java:726)
at hudson.EnvVars.resolve(EnvVars.java:156)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:689)
at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java:128)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:384)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:416)
at hudson.model.Run.run(Run.java:1243)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:304)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:122)
project=hudson.maven.MavenModuleSet@33c36633[TEL Parent]
project.getModules()=[hudson.maven.MavenModule@341840ff[TEL Parent/org.theeuropeanlibrary:parent], hudson.maven.MavenModule@16692a88[TEL Parent/org.theeuropeanlibrary:tel-parent]]
project.getRootModule()=hudson.maven.MavenModule@16692a88[TEL Parent/org.theeuropeanlibrary:tel-parent]
FATAL: null
java.lang.UnsupportedOperationException
at java.util.AbstractMap$SimpleImmutableEntry.setValue(AbstractMap.java:726)
at hudson.EnvVars.resolve(EnvVars.java:156)
at hudson.model.AbstractBuild.getEnvironment(AbstractBuild.java:689)
at hudson.maven.MavenModuleSetBuild.getEnvironment(MavenModuleSetBuild.java:128)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:384)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:416)
at hudson.model.Run.run(Run.java:1243)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:304)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:122)