diff --git a/src/main/java/com/code_intelligence/jazzer/driver/FuzzTargetRunner.java b/src/main/java/com/code_intelligence/jazzer/driver/FuzzTargetRunner.java
index db25a9956..f71226b40 100644
--- a/src/main/java/com/code_intelligence/jazzer/driver/FuzzTargetRunner.java
+++ b/src/main/java/com/code_intelligence/jazzer/driver/FuzzTargetRunner.java
@@ -301,7 +301,8 @@ private static int runOne(long dataPtr, int dataLength) {
       Log.finding(finding);
     }
     if (fatalFindingDeterminatorForJUnit != null) {
-      boolean isFatal = fatalFindingDeterminatorForJUnit.test(data, finding);
+      byte[] crashData = data != null ? data : copyToArray(dataPtr, dataLength);
+      boolean isFatal = fatalFindingDeterminatorForJUnit.test(crashData, finding);
       continueFuzzing = continueFuzzing && !isFatal;
     }
     if (emitDedupToken) {