# 1.9 - modify frozen object exception

**URL:** <https://www.ruby-forum.com/t/1-9-modify-frozen-object-exception/115890>\
**Category:** Ruby\
**Created:** [September 29, 2007, 10:47pm UTC](https://www.ruby-forum.com/t/1-9-modify-frozen-object-exception/115890 "2007-09-29T22:47:08Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![timhunter](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/71e660/32.png) [@timhunter](https://www.ruby-forum.com/u/timhunter)\
**Post date:** [September 29, 2007, 10:47pm UTC](https://www.ruby-forum.com/t/1-9-modify-frozen-object-exception/115890/1 "2007-09-29T22:47:08Z")

</div>

In 1.9, I notice that the exception that is raised for trying to modify  
a frozen object is now RuntimeError instead of TypeError. Is this likely  
to be a permanent change?

---

<div class="post-metadata">

**Author:** ![timhunter](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/71e660/32.png) [@timhunter](https://www.ruby-forum.com/u/timhunter)\
**Post date:** [September 30, 2007, 1:56am UTC](https://www.ruby-forum.com/t/1-9-modify-frozen-object-exception/115890/2 "2007-09-30T01:56:06Z")

</div>

On Sep 29, 2007, at 13:46 , Tim H. wrote:

> In 1.9, I notice that the exception that is raised for trying to  
> modify a frozen object is now RuntimeError instead of TypeError. Is  
> this likely to be a permanent change?

From ChangeLog: