dedecms织梦：Call to a member function GetInnerText() 报错

我爱模板网在用dedecms给客户做网站时，新建了个栏目，添加文章时一切正常，但是，当再此打开这个文章进行编辑时，就出现了下面的错误：

Fatal error: Uncaught Error: Call to a member function GetInnerText() on string in /www/wwwroot/www.5imoban.net/include/customfields.func.php:539 Stack trace: #0 /www/wwwroot/www.5imoban.net/woaimoban/inc/inc_archives_functions.php(560): GetFormItemValue(Object(DedeTag), '', 'admin') #1 /www/wwwroot/www.5imoban.net/woaimoban/inc/inc_archives_functions.php(615): GetFormItemValueA(Object(DedeTag), '') #2 /www/wwwroot/www.5imoban.net/woaimoban/templets/archives_edit.htm(195): PrintAutoFieldsEdit('<field:flashpic...', Array) #3 /www/wwwroot/www.5imoban.net/woaimoban/archives_edit.php(50): include('/www/wwwroot/ww...') #4 {main} thrown in /www/wwwroot/www.5imoban.net/include/customfields.func.php on line 539

结合网上的方法，需要修改两处，即可解决问题（之前没有出现这种情况，换成了php 7就出现了，应该是之前的dedecms织梦版本问题）：
1、打开/inculde/taglib/channel/img.lib.php，找到51行所在的代码，

$innerTmp = $arcTag->GetInnerText();

替换为：

$innerTmp = ($arcTag=="") ? trim($arcTag) : trim($arcTag->GetInnerText());

2、打开/include/customfields.func.php，找到539行：

$fvalue = trim($ntag->GetInnerText());

替换为：

$fvalue = $ntag=="" ? trim($ntag) : trim($ntag->GetInnerText());

完成上面两步，问题解决