# Upgrade 8.4.4 \> 8.5.12 \> 9.5.7

**URL:** <https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105>\
**Category:** Installation\
**Created:** [October 26, 2026, 11:23pm UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105 "2026-10-26T23:23:50Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Mike0924](https://forums.concretecms.org/user_avatar/forums.concretecms.org/mike0924/32/6298_2.png) [@Mike0924](https://forums.concretecms.org/u/Mike0924)\
**Post date:** [October 26, 2026, 11:23pm UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105/1 "2026-10-26T23:23:50Z")

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I have upgraded my site from 8.4.4 to 8.5.12 successfully. The dashboard then reports an update is available to update to 9.5.7. That was the goal of this exercise. The update to 9.5.7 is applied and when I go to login the login page is loading with a blue bar “sign in” however the username and password fields appear and disappear instantly, so I’m not able to log-in. The front-end is loading as expected, just the back-end is not working.

Browser console shows this error:

> Uncaught TypeError: Cannot read properties of undefined (reading ‘fire’)  
> at HTMLLIElement. (login:203:40)  
> at HTMLLIElement.dispatch (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:40035)  
> at v.handle (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:38006)  
> at Object.trigger (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:70124)  
> at HTMLLIElement. (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:70726)  
> at ce.each (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:3129)  
> at ce.fn.init.each (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:1594)  
> at ce.fn.init.trigger (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:70701)  
> at ce.fn. [as click] (jquery.js?ccm\_nocache=a1b8e14e4647845a908db2159aa6f0a8823b313b:2:86549)  
> at main.js:1:750

What could I try to resolve the issue?

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<div class="post-metadata">

**Author:** ![Mike0924](https://forums.concretecms.org/user_avatar/forums.concretecms.org/mike0924/32/6298_2.png) [@Mike0924](https://forums.concretecms.org/u/Mike0924)\
**Post date:** [October 27, 2026, 1:49am UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105/2 "2026-10-27T01:49:55Z")

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If I interrupt the loading of the page (ESC) I’m presented with the fields and I’m able to log-in. Though what could the trigger be for hiding the fields?

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**Author:** ![JohntheFish](https://forums.concretecms.org/user_avatar/forums.concretecms.org/johnthefish/32/3767_2.png) [@JohntheFish](https://forums.concretecms.org/u/JohntheFish)\
**Post date:** [October 27, 2026, 9:11am UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105/3 "2026-10-27T09:11:52Z")

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What theme are you using? Was your login page in v8 styled with the site theme?

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<div class="post-metadata">

**Author:** ![Mike0924](https://forums.concretecms.org/user_avatar/forums.concretecms.org/mike0924/32/6298_2.png) [@Mike0924](https://forums.concretecms.org/u/Mike0924)\
**Post date:** [October 28, 2026, 2:22am UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105/4 "2026-10-28T02:22:28Z")

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There were 2 pages in httpdocs / application / single\_pages removing those and it works as expected.

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**Author:** ![plitochnik](https://forums.concretecms.org/user_avatar/forums.concretecms.org/plitochnik/32/6298_2.png) [@plitochnik](https://forums.concretecms.org/u/plitochnik)\
**Post date:** [November 2, 2026, 11:49am UTC](https://forums.concretecms.org/t/upgrade-8-4-4-8-5-12-9-5-7/10105/5 "2026-11-02T11:49:47Z")

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Good find. Old v8 single\_pages overrides seem to bite a lot of people after the jump to 9, I’d have a quick look through the rest of application/ for leftovers like that before calling it done.