diff --git a/drm/drmserver/DrmManager.cpp b/drm/drmserver/DrmManager.cpp
index 537791c..49df1c8 100644
--- a/drm/drmserver/DrmManager.cpp
+++ b/drm/drmserver/DrmManager.cpp
@@ -117,7 +117,11 @@
 status_t DrmManager::setDrmServiceListener(
             int uniqueId, const sp<IDrmServiceListener>& drmServiceListener) {
     Mutex::Autolock _l(mLock);
-    mServiceListeners.add(uniqueId, drmServiceListener);
+    if (NULL != drmServiceListener.get()) {
+        mServiceListeners.add(uniqueId, drmServiceListener);
+    } else {
+        mServiceListeners.removeItem(uniqueId);
+    }
     return DRM_NO_ERROR;
 }
 
diff --git a/drm/libdrmframework/DrmManagerClient.cpp b/drm/libdrmframework/DrmManagerClient.cpp
index fa3d52a..8bb00c3 100644
--- a/drm/libdrmframework/DrmManagerClient.cpp
+++ b/drm/libdrmframework/DrmManagerClient.cpp
@@ -31,6 +31,7 @@
 DrmManagerClient::~DrmManagerClient() {
     DrmManagerClientImpl::remove(mUniqueId);
     mDrmManagerClientImpl->removeClient(mUniqueId);
+    mDrmManagerClientImpl->setOnInfoListener(mUniqueId, NULL);
     delete mDrmManagerClientImpl; mDrmManagerClientImpl = NULL;
 }
 
diff --git a/drm/libdrmframework/DrmManagerClientImpl.cpp b/drm/libdrmframework/DrmManagerClientImpl.cpp
index 32fa491..eea312b 100644
--- a/drm/libdrmframework/DrmManagerClientImpl.cpp
+++ b/drm/libdrmframework/DrmManagerClientImpl.cpp
@@ -81,7 +81,8 @@
             int uniqueId, const sp<DrmManagerClient::OnInfoListener>& infoListener) {
     Mutex::Autolock _l(mLock);
     mOnInfoListener = infoListener;
-    return getDrmManagerService()->setDrmServiceListener(uniqueId, this);
+    return getDrmManagerService()->setDrmServiceListener(uniqueId,
+            (NULL != infoListener.get()) ? this : NULL);
 }
 
 status_t DrmManagerClientImpl::installDrmEngine(int uniqueId, const String8& drmEngineFile) {
diff --git a/include/drm/DrmManagerClient.h b/include/drm/DrmManagerClient.h
index 3dbfbe2..004556f 100644
--- a/include/drm/DrmManagerClient.h
+++ b/include/drm/DrmManagerClient.h
@@ -49,6 +49,9 @@
     class OnInfoListener: virtual public RefBase {
 
     public:
+        virtual ~OnInfoListener() {}
+
+    public:
         virtual void onInfo(const DrmInfoEvent& event) = 0;
     };