NonTxPutIfAbsentDuringLeaveStressTest.testNodeLeavingDuringPutIfAbsent still fails randomly

java.util.concurrent.ExecutionException: java.lang.AssertionError: expected:<value_48_1> but was:<null>
    at java.util.concurrent.FutureTask.report(FutureTask.java:122)
    at java.util.concurrent.FutureTask.get(FutureTask.java:206)
    at org.infinispan.distribution.rehash.NonTxPutIfAbsentDuringLeaveStressTest.testNodeLeavingDuringPutIfAbsent(NonTxPutIfAbsentDuringLeaveStressTest.java:97)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:348)
    at org.testng.SuiteRunner.access$000(SuiteRunner.java:38)
    at org.testng.SuiteRunner$SuiteWorker.run(SuiteRunner.java:382)
    at org.testng.internal.thread.ThreadUtil$2.call(ThreadUtil.java:64)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.AssertionError: expected:<value_48_1> but was:<null>
    at org.testng.AssertJUnit.fail(AssertJUnit.java:59)
    at org.testng.AssertJUnit.failNotEquals(AssertJUnit.java:364)
    at org.testng.AssertJUnit.assertEquals(AssertJUnit.java:80)
    at org.testng.AssertJUnit.assertEquals(AssertJUnit.java:88)
    at org.infinispan.distribution.rehash.NonTxPutIfAbsentDuringLeaveStressTest$1.doPut(NonTxPutIfAbsentDuringLeaveStressTest.java:82)
    at org.infinispan.distribution.rehash.NonTxPutIfAbsentDuringLeaveStressTest$1.call(NonTxPutIfAbsentDuringLeaveStressTest.java:66)
    at org.infinispan.test.AbstractInfinispanTest$LoggingCallable.call(AbstractInfinispanTest.java:478)
    ... 4 more