fixup! js/common: Helper for Object.freeze from Go

js/common/frozen_object.go

@@ -50,16 +50,18 @@ func (f *freezing) deepFreeze(val goja.Value) error {
 
 	for _, key := range o.Keys() {
 		prop := o.Get(key)
-		if prop != nil {
-			frozen, err := f.isFrozen(goja.Undefined(), prop)
-			if err != nil {
-				return err
-			}
-			if !frozen.ToBoolean() { // prevent cycles
-				if err = f.deepFreeze(prop); err != nil {
-					return fmt.Errorf("deep freezing the property %s failed: %w", key, err)
-				}
-			}
+		if prop == nil {
+			continue
+		}
+		frozen, err := f.isFrozen(goja.Undefined(), prop)
+		if err != nil {
+			return err
+		}
+		if frozen.ToBoolean() { // prevent cycles
+			continue
+		}
+		if err = f.deepFreeze(prop); err != nil {
+			return fmt.Errorf("deep freezing the property %s failed: %w", key, err)
 		}
 	}