Error in render: "TypeError: Cannot read property 'applyShipmentItems' of null

这个是报错信息

在这个代码中的applyShipmentItems，是空了

<el-card shadow="never" class="box-card" v-if="form.applyShipment.applyShipmentItems.length>0" style="margin-top: 20px;cursor: pointer;" @click.native="handleEdit(6)">
                <div slot="header" class="clearfix">
                    <span class="head_tital">送货</span>
                </div>
                <div>
                    <label>送货公司 | {{form.applyShipment.company}}</label> &nbsp; &nbsp; &nbsp;
                    <label>送货数量 | {{form.applyShipment.number}}</label> &nbsp; &nbsp; &nbsp;
                    <label>联系人 | {{form.applyShipment.contactPerson}}</label>
                </div>
                <el-table
                        :data="form.applyShipment.applyShipmentItems" style="width: 100%" class="noHead">
                    <el-table-column>
                        <template slot-scope="scope">
                            <ul class="table_inner_ul">
                                <li><label class="table_inner_text">{{scope.row.description}}</label></li>
                                <li><label class="table_inner_small">描述</label></li>
                            </ul>
                        </template>
                    </el-table-column>
                </el-table>
            </el-card>

应该是哪里出问题了呢，求大佬解答

applyShipmentItems是什么数据类型？直接判他不等于null
v-if="form.applyShipment.applyShipmentItems!=null"

这不是很明显吗