Splitter: stateString is undefined

[Rakasch]

Describe the bug

I have a Splitter like this
<Splitter stateKey="ModSt/TaskView/comment_splitter_3panels" stateStorage="local">

Somehow my stateString became undefined.
Therefore my panelSizes became invalid, too.

The worst thing is that you can't get out of this state without deleting the localstorage manually.
The component should at least catch the case that the json may be invalid, to be able to recover.

Reproducer

PrimeVue version

3.39.1

Vue version

3.x

Language

ES6

Build / Runtime

Vite

Browser(s)

No response

Steps to reproduce the behavior

No response

Expected behavior

No response