NativeScript
diff --git a/tests/app/data/observable-tests.ts b/tests/app/data/observable-tests.ts
@@ -521,7 +521,18 @@ export function test_CorrectPropertyValueAfterUsingWrappedValue() {
 
     testObservable.set("property1", wrappedArray);
 
-    TKUnit.assertEqual(testObservable.get("property1"), testArray, "WrappedValue is used only to execute property change logic and unwrapped value should be used as proeprty value.");
+    TKUnit.assertEqual(testObservable.get("property1"), testArray, "WrappedValue is used only to execute property change logic and unwrapped value should be used as property value.");
+}
+
+export function test_CorrectPropertyValueAfterUsingStringEmptyWrappedValue() {
+    const emptyString = "";
+    let testObservable = fromObject({ "property1": emptyString });
+
+    let wrappedEmptyString = WrappedValue.wrap(emptyString);
+
+    testObservable.set("property1", wrappedEmptyString);
+
+    TKUnit.assertEqual(testObservable.get("property1"), emptyString, "WrappedValue is used only to execute property change logic and unwrapped value should be used as property value.");
 }
 
 export function test_NestedObservablesWithObservableArrayShouldNotCrash() {

diff --git a/tns-core-modules/data/observable/observable.ts b/tns-core-modules/data/observable/observable.ts
@@ -13,7 +13,7 @@ export class WrappedValue implements WrappedValueDefinition {
     }
 
     public static unwrap(value: any) {
-        return (value && value.wrapped) ? value.wrapped : value;
+        return (value instanceof WrappedValue) ? value.wrapped : value;
     }
 
     public static wrap(value: any) {
@@ -249,4 +249,4 @@ export function fromObjectRecursive(source: any): Observable {
     let observable = new ObservableFromObject();
     addPropertiesFromObject(observable, source, true);
     return observable;
-}
+}