From 1c1355994a66d2af714de5cc033da0a27abe146e Mon Sep 17 00:00:00 2001
From: Martin Odersky <odersky@gmail.com>
Date: Thu, 30 Mar 2017 17:15:10 +0200
Subject: Fix ParallelTesting NPE

---
 compiler/test/dotty/tools/dotc/ParallelTesting.scala | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler/test/dotty/tools/dotc/ParallelTesting.scala b/compiler/test/dotty/tools/dotc/ParallelTesting.scala
index 45de03b48..80c56808b 100644
--- a/compiler/test/dotty/tools/dotc/ParallelTesting.scala
+++ b/compiler/test/dotty/tools/dotc/ParallelTesting.scala
@@ -423,7 +423,8 @@ trait ParallelTesting { self =>
   extends Test(testSources, times, threadLimit, suppressAllOutput) {
     private def runMain(dir: JFile, testSource: TestSource): Array[String] = {
       def renderStackTrace(ex: Throwable): String =
-        ex.getStackTrace
+        if (ex == null) ""
+        else ex.getStackTrace
           .takeWhile(_.getMethodName != "invoke0")
           .mkString("    ", "\n    ", "")
 
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