Hey Comrade_Zero,

it sounds like your node-red is in a corrupted state. Please try the following:

Disable the autostart of your node-red:

sudo systemctl disable nodered.service

Stop node-red:

sudo node-red-stop

Start node-red in safe-mode:

sudo node-red --safe

Now repair your flow and enable the autostart again:

sudo systemctl disable nodered.service

BR

I also found some information in the node-red-forum.

forum user

The quickest test you can do is to rename 

~/.node-red

to something else then restart the service so that Node-RED recreates it. Just to see if it is something in your current configuration that is causing the issue.

If that works, try re-adding the Node packages. If you have a lot, copy the 

package.json

file from your renamed folder to the new one then run the commands:

cd~/.node-red npm install

If that works, you can try putting your flows back.

Another user fixed his issue with:

forum user

But I uninstalled and reinstalled node-red, node.js and npm and worked

Maybe you can try these steps too.

BR