diff --git a/plugins/junit5_rt/src/com/intellij/junit5/JUnit5TestExecutionListener.java b/plugins/junit5_rt/src/com/intellij/junit5/JUnit5TestExecutionListener.java
index 5d6a40ab1dc6..be3c72e47746 100644
--- a/plugins/junit5_rt/src/com/intellij/junit5/JUnit5TestExecutionListener.java
+++ b/plugins/junit5_rt/src/com/intellij/junit5/JUnit5TestExecutionListener.java
@@ -50,7 +50,7 @@ public class JUnit5TestExecutionListener implements TestExecutionListener {
   private long myCurrentTestStart;
   private int myFinishCount;
   private String myRootName;
-  private Set<TestIdentifier> myRoots;
+  private Set<TestIdentifier> myRoots = new HashSet<>();
   private boolean mySuccessful;
 
   public JUnit5TestExecutionListener() {