Reporting test NPE on Windows

INFO: Detected changes in repository [C:\Users\ondra\Desktop\windup-master\reporting\tests\target\furnace1848438124550013464test-addon-dir].
Tests run: 1, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 16.536 sec <<< FAILURE! - in org.jboss.windup.reporting.InlineHintServiceTest
testHintEffort(org.jboss.windup.reporting.InlineHintServiceTest) Time elapsed: 3.931 sec <<< FAILURE!
java.lang.AssertionError: null
at org.junit.Assert.fail(Assert.java:86)
at org.junit.Assert.assertTrue(Assert.java:41)
at org.junit.Assert.assertTrue(Assert.java:52)
at org.jboss.windup.reporting.InlineHintServiceTest.testHintEffort(InlineHintServiceTest.java:80)

Results :

Failed tests:
ClassificationServiceTest.testHintEffort:80 null
InlineHintServiceTest.testHintEffort:80 null