# disableReplaceState undefined?
**URL:** https://meta.discourse.org/t/disablereplacestate-undefined/36340
**Category:** Bug
**Created:** [December 4, 2015, 10:47pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340 "2015-12-04T22:47:33Z")
**Posts on this page:** 9
**Page:** 1
### Author:  [@kcoop](https://meta.discourse.org/u/kcoop)
#### Post date: [December 4, 2015, 10:47pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/1 "2015-12-04T22:47:33Z")
I upgraded Discourse today, and after doing so, some of my users have complained that signing in is giving them a blank page. Investigating further, I’m seeing an exception on the console
> Uncaught TypeError: Cannot set property ‘disableReplaceState’ of undefined
FWIW, it’s happening at application-c138bcb70c1b2d5c6e26cf370fdcf67d.js:58
Any ideas on how to proceed?
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### Author:  [@kcoop](https://meta.discourse.org/u/kcoop)
#### Post date: [December 4, 2015, 10:53pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/2 "2015-12-04T22:53:55Z")
The object that is undefined is Discourse.TopicRoute.
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### Author:  [@Falco](https://meta.discourse.org/u/Falco)
#### Post date: [December 4, 2015, 10:56pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/3 "2015-12-04T22:56:27Z")
Do you have any plug-ins? Are they updated? Looks like Discourse No Constants stuff.
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### Author:  [@kcoop](https://meta.discourse.org/u/kcoop)
#### Post date: [December 4, 2015, 10:58pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/4 "2015-12-04T22:58:35Z")
I do have a few plugins, and they are all up to date. Looking at /admin/upgrade, I am now 1 commit behind the latest discourse, but that’s it.
Can you elaborate on Discourse No Constants?
Edit: I see the discussion about DISCOURSE\_NO\_CONSTANTS now. I’ll look further into that, thanks.
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [December 4, 2015, 11:03pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/5 "2015-12-04T23:03:21Z")
I think that is my plugin, I will update it.
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### Author:  [@kcoop](https://meta.discourse.org/u/kcoop)
#### Post date: [December 4, 2015, 11:03pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/6 "2015-12-04T23:03:43Z")
I was just about to ask… 🙂 Thanks!
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### Author:  [@kcoop](https://meta.discourse.org/u/kcoop)
#### Post date: [December 4, 2015, 11:04pm UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/7 "2015-12-04T23:04:04Z")
You’re talking about browser\_history, right?
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [December 5, 2015, 6:37am UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/8 "2015-12-05T06:37:39Z")
Yes, corrected via
[https://github.com/discourse/browser\_history/commit/3349b6a2df2a40b86c7e9c5acf9865e68fb09e6c](https://github.com/discourse/browser_history/commit/3349b6a2df2a40b86c7e9c5acf9865e68fb09e6c)
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### Author:  [@sam](https://meta.discourse.org/u/sam)
#### Post date: [December 5, 2015, 6:50am UTC](https://meta.discourse.org/t/disablereplacestate-undefined/36340/9 "2015-12-05T06:50:49Z")