diff --git a/doric-js/bundle/doric-sandbox.es5.js b/doric-js/bundle/doric-sandbox.es5.js
index a10052ca..f402cdc4 100644
--- a/doric-js/bundle/doric-sandbox.es5.js
+++ b/doric-js/bundle/doric-sandbox.es5.js
@@ -17203,7 +17203,9 @@ var doric = (function (exports) {
 	    }
 	    hookBeforeNativeCall(context);
 	    Reflect.apply(callback.resolve, context, argumentsList);
-	    context.callbacks.delete(callbackId);
+	    if (callback.retained !== true) {
+	        context.callbacks.delete(callbackId);
+	    }
 	}
 	function jsCallReject(contextId, callbackId, args) {
 	    var arguments$1 = arguments;
@@ -17224,7 +17226,9 @@ var doric = (function (exports) {
 	    }
 	    hookBeforeNativeCall(context);
 	    Reflect.apply(callback.reject, context.entity, argumentsList);
-	    context.callbacks.delete(callbackId);
+	    if (callback.retained !== true) {
+	        context.callbacks.delete(callbackId);
+	    }
 	}
 	var Context = /** @class */ (function () {
 	    function Context(id) {
@@ -17260,7 +17264,8 @@ var doric = (function (exports) {
 	        var functionId = uniqueId('function');
 	        this.callbacks.set(functionId, {
 	            resolve: func,
-	            reject: function () { loge("This should not be called"); }
+	            reject: function () { loge("This should not be called"); },
+	            retained: true,
 	        });
 	        return functionId;
 	    };
diff --git a/doric-js/src/util/types.ts b/doric-js/src/util/types.ts
index 03d01701..00d92f31 100644
--- a/doric-js/src/util/types.ts
+++ b/doric-js/src/util/types.ts
@@ -23,7 +23,7 @@ export function obj2Model(obj: Model, convertor: (v: Function) => string): Model
         return obj.map(e => obj2Model(e, convertor)) as Model
     } else if (obj instanceof Object) {
         if (Reflect.has(obj, 'toModel') && Reflect.get(obj, 'toModel') instanceof Function) {
-            obj = Reflect.apply(Reflect.get(obj, 'toModel'), obj, [])
+            obj = Reflect.apply(Reflect.get(obj, 'toModel') as Function, obj, [])
             return obj
         } else {
             for (let key in obj) {