# Error in Log

**URL:** <https://forum.mautic.org/t/error-in-log/20905>\
**Category:** Mautic 4 Install/Upgrade Support\
**Created:** [September 16, 2021, 6:00pm UTC](https://forum.mautic.org/t/error-in-log/20905 "2021-09-16T18:00:31Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![patodorf](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/patodorf/32/3034_2.png) [@patodorf](https://forum.mautic.org/u/patodorf)\
**Post date:** [September 16, 2021, 6:00pm UTC](https://forum.mautic.org/t/error-in-log/20905/1 "2021-09-16T18:00:31Z")

</div>

**Your software**  
_My PHP version is_ : 7.4.23  
_My MySQL/MariaDB version is_ (delete as applicable): MySQL/MariaDB version

**Updating/Installing Errors**  
_I am_ (delete as applicable): Installing / Updating  
_Upgrading/installing via_ (delete as applicable) : Web / Command Line

_These errors are showing in the installer_ :

_These errors are showing in the Mautic log_ :

[2021-09-16 16:26:27] mautic.ERROR: Invalid clickthrough value: Yjo4OntmOjk6ImZiaGVkZiI7Yjo1Ont2OjM7Zjo0NzoiZGJ6Y2J2dGEuZmlmYWciO3Y6NDt2OjcyMTt9Zjo4OiJmemJ2eSI7djo4NTtmOjc6ImZnYmciO2Y6NTU6Ijk0NzYwMzRjOWVkODU3Mzc4NTQ2MTYiO2Y6NzoieWZiZSI7Zjo5OiI1NjUxNTUiO2Y6MDoiZHViYWFmeSI7Yjo0OntmOjg6ImZ6YnZ5Ijt2Ojg1O319 {“exception”:"[object] (Mautic\CoreBundle\Exception\InvalidDecodedStringException(code: 0): The string b:8:{f:9:“fbhedf”;b:5:{v:3;f:47:“dbzcbvta.fifag”;v:4;v:721;}f:8:“fzbvy”;v:85;f:7:“fgbg”;f:55:“9476034c9ed85737854616”;f:7:“yfbe”;f:9:“565155”;f:0:“dubaafy”;b:4:{f:8:“fzbvy”;v:85;}} is not a serialized array at /var/www/vhosts/posta.thepulso.com/httpdocs/app/bundles/CoreBundle/Helper/ClickthroughHelper.php:46)"}

**Your problem**  
_My problem is_ :  
I have that error on the Log and how to fix it after updating to 4.0.0

_Steps I have tried to fix the problem_ :  
I’ve already cleaned Caché and update the Schema.

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<div class="post-metadata">

**Author:** ![silavapi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silavapi/32/7424_2.png) [@silavapi](https://forum.mautic.org/u/silavapi)\
**Post date:** [September 16, 2021, 6:21pm UTC](https://forum.mautic.org/t/error-in-log/20905/2 "2021-09-16T18:21:48Z")

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Here is a PR which should address that issue:

> <https://github.com/mautic/mautic/pull/10444>
>
> | Q | A
> | --------------------------------…------ | ---
> | Branch? | "features" for all features, enhancements and bug fixes (until 3.3.0 is released) 
> | Bug fix? | yes/no
> | New feature? | yes/no
> | Deprecations? | yes/no
> | BC breaks? | yes/no
> | Automated tests included? | yes/no
> | Related user documentation PR URL | mautic/mautic-documentation#... 
> | Related developer documentation PR URL | mautic/developer-documentation#... 
> | Issue(s) addressed | Fixes #... 
> 
> \<!--
> Additionally (see https://contribute.mautic.org/contributing-to-mautic/developer/code/pull-requests#step-5-work-on-your-pull-request):
> - Always add tests and ensure they pass.
> - Bug fixes must be submitted against the lowest maintained branch where they apply
> (lowest branches are regularly merged to upper ones so they get the fixes too.)
> - Features and deprecations must be submitted against the "features" branch.
> \--\>
> 
> \<!--
> Please write a short README for your feature/bugfix. This will help people understand your PR and what it aims to do.
> \--\>
> \#### Description:
> This PR fix issue millions logs like:
> 
> \`\[2021-09-02 10:28:41\] mautic.ERROR: Invalid clickthrough value: Yjo4OntmOjk6ImZiaGVkZiI7Yjo1Ont2OjM7Zjo4OiJmemJ2eSI7djo0O3Y6NDAyO31mOjg6ImZ6YnZ5Ijt2OjQwMjtmOjc6ImZnYmciO2Y6NTU6Ijk0NjNiNWNjMWRmNzk5MjcwNjI0NDUiO2Y6NzoieWZiZSI7ZjowOiI0OTY1Nzg1IjtmOjA6ImR1YmFhZnkiO2I6NDp7Zjo4OiJmemJ2eSI7djo0MDI7fX0= {"exception":"\[object\] (Mautic\\\\CoreBundle\\\\Exception\\\\InvalidDecodedStringException(code: 0): The string b:8:{f:9:\\"fbhedf\\";b:5:{v:3;f:8:\\"fzbvy\\";v:4;v:402;}f:8:\\"fzbvy\\";v:402;f:7:\\"fgbg\\";f:55:\\"9463b5cc1df79927062445\\";f:7:\\"yfbe\\";f:0:\\"4965785\\";f:0:\\"dubaafy\\";b:4:{f:8:\\"fzbvy\\";v:402;}} is not a serialized array at..\`
> 
> I collect the requests, and it looks like this kind of requests are from bots (Microsoft....)
> Then we should skip it.
> 
> \<!--
> If you are fixing a bug and if there is no linked issue already, please provide steps to reproduce the issue here.
> \--\>
> 
> \#### Steps to test this PR:
> 1. Load up \[this PR\](https://mautibox.com)
> 2. Go to your page with tracking code
> 3. Add to url \`?ct=Yjo4OntmOjk6ImZiaGVkZiI7Yjo1Ont2OjM7Zjo4OiJmemJ2eSI7djo0O3Y6NTM4O31mOjg6ImZ6YnZ5Ijt2OjUzODtmOjc6ImZnYmciO2Y6NTU6Ijk0NzY4Y2I4YmZhMGY4Nzc2NTMzODEiO2Y6NzoieWZiZSI7Zjo5OiI4MjM5OTgiO2Y6MDoiZHViYWFmeSI7Yjo0OntmOjg6ImZ6YnZ5Ijt2OjUzODt9fQ\`
> 4. Check your logs and you should see error : \`mautic.ERROR: Invalid clickthrough value: \`
> 5. After PR page you should see not tracked page in the browser console - we asume it's bot
> 
> !\[image\](https://user-images.githubusercontent.com/462477/133642035-0df7fb45-59d5-443e-9b21-abb2eb29e04c.png)
> 
> 
> \<!--
> If you have any deprecations, list them here along with the new alternative.
> If you have any backwards compatibility breaks, list them here.
> \--\>

Please test and if it fixes the issue, leave a comment on the pull request!

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<div class="post-metadata">

**Author:** ![Yosu\_Cadilla](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/yosu_cadilla/32/6206_2.png) [@Yosu\_Cadilla](https://forum.mautic.org/u/Yosu_Cadilla)\
**Post date:** [February 21, 2023, 7:15am UTC](https://forum.mautic.org/t/error-in-log/20905/3 "2023-02-21T07:15:54Z")

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I can confirm this is still an issue with Mautic 4.4.x

There’s an open issue on Github, please guys go there and report your case if you have a couple minutes to spare…

> <https://github.com/mautic/mautic/issues/6775>
>
> \[//\]: # ( Invisible comment: 
> IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII…I
> Before you create the issue:
> IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
> Search for similar report among other reported issues.
> Learn how to troubleshoot at https://www.mautic.org/docs/en/tips/troubleshooting.html
> Use drag&drop to attach images or other files )
> 
> \## Bug Description
> After sending emails that contains tracked links I often see such error messages in the log.
> 
> Not all clicks end up in errors like this. So far I could not figure out what leads to this kind of clickthrough error.
> Mautic is behind proxy, runs in docker container
> Locale is set to hungarian UTF-8
> 
> 
> | Q | A
> | --- | ---
> | Mautic version | 2.14.1
> | PHP version | 7.0.28
> | Browser | Firefox 62.0.3
> 
> \### Steps to reproduce
> 1. Create segment mail with tracked link
> 2. Send mail to multiple recipients
> 3. Wait for incoming clicks
>  
> \### Log errors
> \`\[2018-10-15 14:49:21\] mautic.CRITICAL: Uncaught PHP Exception InvalidArgumentException: "The string ,f.&..U"0U{,f....{f.
> ..{.f.lzfj{z.f0.n...lzfj{f.4W.&..e.u/6t..ug.dd..dg.t.dtW.&..W92,..vz..ddd.dcW.&. zW0.,.a0..dzdg;f...{.f.h=
> = is not a serialized array." at /var/www/html/app/bundles/CoreBundle/Helper/ClickthroughHelper.php line 42 \[\]\`
> 
> \[//\]: # ( Invisible comment:
> Please check for related errors in the latest log file in \[mautic root\]/app/log/ and/or the web server's logs and post them here. Be sure to remove sensitive information if applicable. )