A classic example of such a mistake is adding error handling code to take care of NULL Pointers or bad references without looking into the real cause of the invalid references.

此类错误的典型示例是添加错误处理代码以处理NULL指针或错误的引用，却没有查出无效引用的真正原因。

youdao

In addition, avoid returning objects that are null or in an invalid state.

此外，避免返回空对象或者状态无效的对象。

youdao

Since this is an inner join, this view has no rows for records that appear in Wells but not in wells_pts (because they have null or invalid coordinates).

因为这是一个内联结，所以这个视图不包含出现在wells表中但没有出现在wells _ pts表中的记录(因为这些记录具有空的或无效的坐标)。

youdao

Note that there may be nothing to delete, if the coordinates were already null or invalid; but that does not constitute an error.

注意，如果坐标值原来就是null或无效的，那么可能没有要删除的东西；但是，这不会造成错误。

youdao

Note that there may be nothing to delete, if the coordinates were already null or invalid; but that does not constitute an error.

注意，如果坐标值原来就是null或无效的，那么可能没有要删除的东西；但是，这不会造成错误。

youdao