1 files changed, 1 insertions, 0 deletions
diff --git a/hal/Hal.cpp b/hal/Hal.cpp
index 16201a2d8..e60a3ee61 100644
--- a/hal/Hal.cpp
+++ b/hal/Hal.cpp
@@ -590,6 +590,7 @@ UnregisterSensorObserver(SensorType aSensor, ISensorObserver *aObserver) {
   AssertMainThread();
 
   if (!gSensorObservers) {
+    HAL_ERR("Un-registering a sensor when none have been registered");
     return;
   }