--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -10306,18 +10306,20 @@ IonBuilder::getPropTryConstant(bool* emi
     if (!types->mightBeMIRType(MIRType_Object)) {
         // If we have not observed an object result here, don't look for a
         // singleton constant.
         trackOptimizationOutcome(TrackedOutcome::NotObject);
         return true;
     }
 
     JSObject* singleton = testSingletonPropertyTypes(obj, name);
-    if (!singleton)
-        return true;
+    if (!singleton) {
+        trackOptimizationOutcome(TrackedOutcome::NotSingleton);
+        return true;
+    }
 
     // Property access is a known constant -- safe to emit.
     obj->setImplicitlyUsedUnchecked();
 
     pushConstant(ObjectValue(*singleton));
 
     trackOptimizationSuccess();
     *emitted = true;