diff --git a/jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientTLSTest.java b/jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientTLSTest.java
index 14fc9994c3f..4b768387196 100644
--- a/jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientTLSTest.java
+++ b/jetty-client/src/test/java/org/eclipse/jetty/client/HttpClientTLSTest.java
@@ -826,7 +826,8 @@ public class HttpClientTLSTest
             public ByteBuffer acquire(int size, boolean direct)
             {
                 ByteBuffer acquired = super.acquire(size, direct);
-                leakedBuffers.add(acquired);
+                if (acquired != null)
+                    leakedBuffers.add(acquired);
                 return acquired;
             }
 
@@ -895,7 +896,8 @@ public class HttpClientTLSTest
             public ByteBuffer acquire(int size, boolean direct)
             {
                 ByteBuffer acquired = super.acquire(size, direct);
-                leakedBuffers.add(acquired);
+                if (acquired != null)
+                    leakedBuffers.add(acquired);
                 return acquired;
             }
 
@@ -978,7 +980,8 @@ public class HttpClientTLSTest
             public ByteBuffer acquire(int size, boolean direct)
             {
                 ByteBuffer acquired = super.acquire(size, direct);
-                leakedBuffers.add(acquired);
+                if (acquired != null)
+                    leakedBuffers.add(acquired);
                 return acquired;
             }