diff --git a/packages/FusedLocation/src/com/android/location/fused/FusionEngine.java b/packages/FusedLocation/src/com/android/location/fused/FusionEngine.java
index f137373..f909158 100644
--- a/packages/FusedLocation/src/com/android/location/fused/FusionEngine.java
+++ b/packages/FusedLocation/src/com/android/location/fused/FusionEngine.java
@@ -249,7 +249,11 @@
             }
         }
 
-        mCallback.reportLocation(mFusedLocation);
+        if (mCallback != null) {
+          mCallback.reportLocation(mFusedLocation);
+        } else {
+          Log.w(TAG, "Location updates received while fusion engine not started");
+        }
     }
 
     /** Called on mLooper thread */