From ade173bdc762d0fe8ac97a5e189f6802156231a7 Mon Sep 17 00:00:00 2001
From: Munawar <munawar.hafiz@gmail.com>
Date: Mon, 9 Oct 2023 15:45:57 -0700
Subject: [PATCH] fix: Add protection against a possible null dereference issue
 (#1258)

* Comment: Added protection against a possible null dereference issue.

* run linter

---------

Co-authored-by: Sydney Munro <sydmunro@google.com>
---
 .../storage/contrib/nio/SeekableByteChannelPrefetcher.java  | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/SeekableByteChannelPrefetcher.java b/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/SeekableByteChannelPrefetcher.java
index dbdd4e5a..41632f8c 100644
--- a/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/SeekableByteChannelPrefetcher.java
+++ b/google-cloud-nio/src/main/java/com/google/cloud/storage/contrib/nio/SeekableByteChannelPrefetcher.java
@@ -357,8 +357,10 @@ public ByteBuffer fetch(long position) throws InterruptedException, ExecutionExc
       nbMiss++;
       ensureFetching(blockIndex);
       candidate = fetching;
-      buf = candidate.getBuf();
-      full.add(candidate);
+      if (candidate != null) {
+        buf = candidate.getBuf();
+        full.add(candidate);
+      }
       fetching = null;
       ensureFetching(blockIndex + 1);
       return buf;