diff --git a/runtime/jni_internal.cc b/runtime/jni_internal.cc
index 6690519..bbe5fda 100644
--- a/runtime/jni_internal.cc
+++ b/runtime/jni_internal.cc
@@ -844,13 +844,14 @@
   }
 
   static jobject NewGlobalRef(JNIEnv* env, jobject obj) {
-    if (obj == NULL) {
-      return NULL;
-    }
     ScopedObjectAccess soa(env);
+    Object* decoded_obj = soa.Decode<Object*>(obj);
+    // Check for null after decoding the object to handle cleared weak globals.
+    if (decoded_obj == nullptr) {
+      return nullptr;
+    }
     JavaVMExt* vm = soa.Vm();
     IndirectReferenceTable& globals = vm->globals;
-    Object* decoded_obj = soa.Decode<Object*>(obj);
     WriterMutexLock mu(soa.Self(), vm->globals_lock);
     IndirectRef ref = globals.Add(IRT_FIRST_SEGMENT, decoded_obj);
     return reinterpret_cast<jobject>(ref);
@@ -884,11 +885,13 @@
   }
 
   static jobject NewLocalRef(JNIEnv* env, jobject obj) {
-    if (obj == NULL) {
-      return NULL;
-    }
     ScopedObjectAccess soa(env);
-    return soa.AddLocalReference<jobject>(soa.Decode<Object*>(obj));
+    mirror::Object* decoded_obj = soa.Decode<Object*>(obj);
+    // Check for null after decoding the object to handle cleared weak globals.
+    if (decoded_obj == nullptr) {
+      return nullptr;
+    }
+    return soa.AddLocalReference<jobject>(decoded_obj);
   }
 
   static void DeleteLocalRef(JNIEnv* env, jobject obj) {
diff --git a/runtime/thread.cc b/runtime/thread.cc
index bc252de..9faa60d 100644
--- a/runtime/thread.cc
+++ b/runtime/thread.cc
@@ -1147,7 +1147,7 @@
     result = Runtime::Current()->GetJavaVM()->DecodeWeakGlobal(const_cast<Thread*>(this), ref);
     if (result == kClearedJniWeakGlobal) {
       // This is a special case where it's okay to return NULL.
-      return NULL;
+      return nullptr;
     }
   }