During one of the ant targets invoked in Ant step I got the following error:

09:59:52 ERROR: Processing failed due to a bug in the code. Please report this to jenkinsci-users@googlegroups.com
09:59:57 java.lang.NullPointerException
10:00:02 at hudson.tasks.Ant.buildFilePath(Ant.java:240)
10:00:07 at hudson.tasks.Ant.perform(Ant.java:165)
10:00:12 at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
10:00:17 at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:804)
10:00:22 at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.build(MavenModuleSetBuild.java:829)
10:00:27 at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:780)
10:00:27 at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:586)
10:00:27 at hudson.model.Run.execute(Run.java:1576)
10:00:27 at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:486)
10:00:27 at hudson.model.ResourceController.execute(ResourceController.java:88)
10:00:33 at hudson.model.Executor.run(Executor.java:241)
10:00:33 project=hudson.maven.MavenModuleSet@6ca4040a[------]