Trying to access array offset on value of type null

                <div class="artInfo-name"><?php echo $data['newsname']; ?></div>
                <div class="artInfo-ab">
                    <span>发布时间：<?php echo $data['time']; ?></span>
                    <span>浏览数：<?php echo $data['views']; ?></span>
                </div>
                <div class="artInfo-con">
                    <?php echo $data['content']; ?>
                </div>
                <div class="artInfo-page clearfix">
                    <a href="<?php echo addon_url('wwh/index/news_detail',[':id'=>$after['id']]); ?>" title="<?php echo $after['newsname']; ?>"  class="fl"><span class="type">上一篇 :</span><?php echo $after['newsname']; ?></a>
                    <a href="<?php echo addon_url('wwh/index/news_detail',[':id'=>$front['id']]); ?>"  class="fr" title="<?php echo $front['newsname']; ?>"><span class="type">下一篇 :</span><?php echo $front['newsname']; ?></a>
                </div>
            </div>

            <div class="artInfo-right">
                <div class="aiAbout-news">
                    <div class="top">热门文章</div>
                    <ul class="list">
                        <?php if(is_array($news2) || $news2 instanceof \think\Collection || $news2 instanceof \think\Paginator): $i = 0; $__LIST__ = $news2;if( count($__LIST__)==0 ) : echo "" ;else: foreach($__LIST__ as $key=>$vo): $mod = ($i % 2 );++$i;?>