<select >组件使用报错问题

选择选项时报错如下: [Vue warn]: Error in v-on handler: "TypeError: Array.prototype.filter called on null or undefined"

found in

---> <Inventory> at components/inventory/inventory.vue:1
　　　　at pages/business/asset/asset.vue:1
20:19:31.879 TypeError: Array.prototype.filter called on null or undefined

页面代码:
<view>
<select v-model="dept">
<option v-for="item in departments" :value="item.DEPT">{{item.DEPT}}
</option>
</select>

        </view>  

JS代码:

data() {  
        return {  
            sMonth: "",  
            statustxt: uni.getStorageSync("pd_statustxt") || "创建",  
            dept: "",  
            departments:  [ ],  
            sndatas: [],  
            isviewbt: true,  
            pdobject: {},  
            FactoryNo: null,  

        };  
    }