Error writing test results

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1

I have a Spock test that uses a GPars pool to execute parts of the test using multiple threads. Each of the Threads can throw a SpockAssertionError.
If that happens, it will lead to an error when trying to write the test results:

...
Caused by: java.lang.IllegalArgumentException: Cannot encode a null string.
    at org.gradle.internal.serialize.kryo.KryoBackedEncoder.writeString(KryoBackedEncoder.java:68)
    at org.gradle.api.internal.tasks.testing.junit.result.TestResultSerializer.write(TestResultSerializer.java:85)
    at org.gradle.api.internal.tasks.testing.junit.result.TestResultSerializer.write(TestResultSerializer.java:72)
    at org.gradle.api.internal.tasks.testing.junit.result.TestResultSerializer.write(TestResultSerializer.java:62)
    at org.gradle.api.internal.tasks.testing.junit.result.TestResultSerializer.write(TestResultSerializer.java:48)
    at org.gradle.api.tasks.testing.Test.executeTests(Test.java:536)

I can reproduce this with Gradle 2.4, 2.3, and 2.2.