diff --git a/src/sensor.hpp b/src/sensor.hpp
index d2ba8af..434d81d 100644
--- a/src/sensor.hpp
+++ b/src/sensor.hpp
@@ -490,6 +490,11 @@
         if (!readingStateGood())
         {
             markAvailable(false);
+            for (auto& threshold : thresholds)
+            {
+                assertThresholds(this, value, threshold.level,
+                                 threshold.direction, false);
+            }
             updateValueProperty(std::numeric_limits<double>::quiet_NaN());
             return;
         }