Here is the stack trace that I am getting:
[xUnit] [INFO] - Starting to record.
[xUnit] [INFO] - Processing PHPUnit-3.4 (default)
[xUnit] [INFO] - [PHPUnit-3.4 (default)] - 1 test report file(s) were found with the pattern 'build/unit-tests.xml' relative to '/var/lib/jenkins/jobs/respond-COMMIT/workspace' for the testing framework 'PHPUnit-3.4 (default)'.
[xUnit] [INFO] - Check 'Failed Tests' threshold.
ERROR: Publisher com.thalesgroup.hudson.plugins.xunit.XUnitPublisher aborted due to exception
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:470)
at java.lang.Integer.parseInt(Integer.java:499)
at org.jenkinsci.plugins.xunit.threshold.XUnitThreshold.convertToInteger(XUnitThreshold.java:60)
at org.jenkinsci.plugins.xunit.threshold.XUnitThreshold.getResultThreshold(XUnitThreshold.java:76)
at org.jenkinsci.plugins.xunit.threshold.FailedThreshold.getResultThreshold(FailedThreshold.java:33)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.processResultThreshold(XUnitPublisher.java:357)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.getResultWithThreshold(XUnitPublisher.java:345)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.setBuildStatus(XUnitPublisher.java:330)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.performXUnit(XUnitPublisher.java:133)
at com.thalesgroup.hudson.plugins.xunit.XUnitPublisher.perform(XUnitPublisher.java:101)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:692)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:667)
at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:645)
at hudson.model.Build$RunnerImpl.post2(Build.java:162)
at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:614)
at hudson.model.Run.run(Run.java:1429)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:238)