SerializableClosure error in Laravel - Your serialized closure might have been modified and it's unsafe to be unserialized

Question

I am getting this error in my domain where I have used laravel v8 for my site.

It shows error in line no 52 in index file:

Previously my .env file was not reading. As soon as I fixed that error I got this one now. Please help me solve this error.

Persis

how do you resolve this? I'm seeing the same issue – Taishataisho

How did you resolve this this issue? – Dramaturge

@theodory It was because of App_key in .env file. So, you can generate key using php artisan key:generate. In case it is not working, you can try the following code in cmd: composer run post-root-package-install – Persis

Thank you @CherrylRarewings I regenerated the key and everything was fixed. – Dramaturge

In my case there was an error in my composer install log. I had an artisan command with a bad classname. Same error however with the serialized closure – Lionize

Answer 1

This issue might occur due to change in APP_KEY value in your .env file.

APP_KEY is used for secure data transmission and Laravel recommends to do that by setting it to a random string.

This APP_KEY is used for

• Encrypting cookies.
• Creating the signature for signed URLs and queued closures.
• Encrypting values using the encrypt() and decrypt() helpers.

A encrypted data can be decrypted if you use the same key which was used while encrypting.

So if possible look for a backup .env file and use the same APP_KEY to resolve it.

Kathikathiawar

What if I want to change to a new key? Anyway to clear the previous cached content? – Hawkeyed

Encrypted data can be stored in cache or databse too. If the concent is such that, you can remove it, you can easily do that but sometimes it can be secrets which are used by your users. In that situation you need a migration from old encryption to the new one. – Kathikathiawar

Answer 2

What solved it for me was running the following in my project folder:

php artisan route:clear

I also ran the below commands before the above command, but the error persisted. It only went away when I did the above. For reference, here are the commands I ran beforehand:

php artisan cache:clear
php artisan config:clear
php artisan view:clear
npm run dev
php artisan key:generate

I also want to note that I am using the following stack:

Laravel v8
Jetstream
Inertia
Vue2

Keating

This php artisan route:clear was the solution for me – Judicative

I suggest the php artisan optimize command that combines the functionality of both the "cache:clear" and "route:clear" commands and perform other useful actions to improve the app's performance. – Lacteal

Answer 3

It happened to me when I replaced in production my .env file with the .env from development. It was failing because it had a different APP_KEY, so I had to generate a new APP_KEY on production.

It was solved after run these commands:

php artisan key:generate
php artisan config:cache
php artisan route:cache
php artisan view:cache

Maybe it isn't necessary to clear the views and routes.

Eppes

Answer 4

Sometimes php artisan cache:clear doesn't work..

You should remove manually. Example

rm -rf bootstrap/cache/*.php

Redwine

This has helped me in several situations where tests have failed. – Nock

This was the solution for me - I tried all others, but this one worked – Squirm

Answer 5

Yes the error often occurs when a new APP_KEY is generated and the changes are not picked up by the server. I'll advise you run this command in the project root directory after the new key generation.

php artisan optimize

It worked well for me!

Terret

This ensures all the previous cache is cleared and routes and files reconfiguration – Terret

Answer 6

try this command

 composer update

Furtive

Your answer has been flagged as low quality because of its length. It would be best if you explained your solution and perhaps pasted a link to a reference. – Sentimental

Answer 7

If nothing above works then just delete vendor directory and run composer install command.

Horseshit

Answer 8

In vendor → .env,

change APP_URL to http://localhost.

Waggish