diff --git a/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java b/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
index 3a09c5d55..5bcdc2780 100644
--- a/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
+++ b/core/src/main/java/com/taobao/arthas/core/command/klass100/RedefineCommand.java
@@ -113,7 +113,8 @@ public class RedefineCommand extends AnnotatedCommand {
         List<ClassDefinition> definitions = new ArrayList<ClassDefinition>();
         for (Class<?> clazz : inst.getAllLoadedClasses()) {
             if (bytesMap.containsKey(clazz.getName())) {
-                if (hashCode != null && !Integer.toHexString(clazz.getClassLoader().hashCode()).equals(hashCode)) {
+                ClassLoader classLoader = clazz.getClassLoader();
+                if (classLoader != null && hashCode != null && !Integer.toHexString(classLoader.hashCode()).equals(hashCode)) {
                     continue;
                 }
                 definitions.add(new ClassDefinition(clazz, bytesMap.get(clazz.getName())));