diff --git a/packages/SystemUI/src/com/android/systemui/util/sensors/ThresholdSensorImpl.java b/packages/SystemUI/src/com/android/systemui/util/sensors/ThresholdSensorImpl.java
index 546333b3a073b..333e8da2a84f3 100644
--- a/packages/SystemUI/src/com/android/systemui/util/sensors/ThresholdSensorImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/util/sensors/ThresholdSensorImpl.java
@@ -167,7 +167,7 @@ class ThresholdSensorImpl implements ThresholdSensor {
 
     private void onSensorEvent(boolean below, long timestampNs) {
         Assert.isMainThread();
-        if (mLastBelow != null && mLastBelow == below) {
+        if (!mRegistered || mLastBelow != null && mLastBelow == below) {
             return;
         }
         mLastBelow = below;
diff --git a/packages/SystemUI/tests/src/com/android/systemui/util/sensors/ThresholdSensorImplTest.java b/packages/SystemUI/tests/src/com/android/systemui/util/sensors/ThresholdSensorImplTest.java
index 09ec8e55efd62..70b92dc014472 100644
--- a/packages/SystemUI/tests/src/com/android/systemui/util/sensors/ThresholdSensorImplTest.java
+++ b/packages/SystemUI/tests/src/com/android/systemui/util/sensors/ThresholdSensorImplTest.java
@@ -226,6 +226,23 @@ public class ThresholdSensorImplTest extends SysuiTestCase {
         waitForSensorManager();
     }
 
+    @Test
+    public void testAlertAfterPause() {
+        TestableListener listener = new TestableListener();
+
+        mThresholdSensor.register(listener);
+        waitForSensorManager();
+        mFakeProximitySensor.sendProximityResult(false);
+        assertTrue(listener.mBelow);
+        assertEquals(1, listener.mCallCount);
+
+        mThresholdSensor.pause();
+
+        mFakeProximitySensor.sendProximityResult(false);
+        assertTrue(listener.mBelow);
+        assertEquals(1, listener.mCallCount);
+    }
+
     static class TestableListener implements ThresholdSensor.Listener {
         boolean mBelow;
         long mTimestampNs;