Trying to access array offset on value of type null

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            <?php if(is_array($contact['wechat']) || $contact['wechat'] instanceof \think\Collection || $contact['wechat'] instanceof \think\Paginator): $k = 0; $__LIST__ = $contact['wechat'];if( count($__LIST__)==0 ) : echo "" ;else: foreach($__LIST__ as $key=>$vo): $mod = ($k % 2 );++$k;if(!(empty($vo) || (($vo instanceof \think\Collection || $vo instanceof \think\Paginator ) && $vo->isEmpty()))): ?>
            <img class="qqLogo qrcode-<?php echo htmlentities($k); ?>" src="<?php echo htmlentities($vo); ?>" alt="辣椒HTTP">
            <?php endif; ?>
            <?php endforeach; endif; else: echo "" ;endif; ?>
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