diff --git a/graphics/composer/2.1/default/ComposerClient.cpp b/graphics/composer/2.1/default/ComposerClient.cpp
index 7a2cb25..72ba8f8 100644
--- a/graphics/composer/2.1/default/ComposerClient.cpp
+++ b/graphics/composer/2.1/default/ComposerClient.cpp
@@ -230,6 +230,8 @@
 
 ComposerClient::~ComposerClient()
 {
+    ALOGD("client destroyed");
+
     mHal.enableCallback(false);
     mHal.removeClient();
 
@@ -275,17 +277,23 @@
         }
     }
 
-    mCallback->onHotplug(display, connected);
+    auto ret = mCallback->onHotplug(display, connected);
+    ALOGE_IF(!ret.isOk(), "failed to send onHotplug: %s",
+            ret.description().c_str());
 }
 
 void ComposerClient::onRefresh(Display display)
 {
-    mCallback->onRefresh(display);
+    auto ret = mCallback->onRefresh(display);
+    ALOGE_IF(!ret.isOk(), "failed to send onRefresh: %s",
+            ret.description().c_str());
 }
 
 void ComposerClient::onVsync(Display display, int64_t timestamp)
 {
-    mCallback->onVsync(display, timestamp);
+    auto ret = mCallback->onVsync(display, timestamp);
+    ALOGE_IF(!ret.isOk(), "failed to send onVsync: %s",
+            ret.description().c_str());
 }
 
 Return<void> ComposerClient::registerCallback(