diff --git a/tns-core-modules/ui/core/dependency-observable.ts b/tns-core-modules/ui/core/dependency-observable.ts
index 1cf135dbc..da3358f5f 100644
--- a/tns-core-modules/ui/core/dependency-observable.ts
+++ b/tns-core-modules/ui/core/dependency-observable.ts
@@ -212,6 +212,10 @@ export class DependencyObservable extends Observable implements definition.Depen
     }
 
     public _resetValue(property: Property, valueSource: number = ValueSource.Local): void {
+        if (!property){
+            console.log(`>>>>>>>>>>>>>>>>>>>>>>>>>>>> Someone is passing undefined property!`);
+            console.trace();
+        }
         let entry: PropertyEntry = this._propertyEntries[property.id];
         if (!entry) {
             return;