Please enter a valid value when editing user, what value?

[unproperlypropagated]

I'm trying to shorten a user signature.
And I get "please enter a valid value".

My question is: value for what?

Could this error be more specific?
For example what field is it validating?
Is not the signature since I emptied it and still get that.


Please enter a valid value when editing user, what value?

free plugins
minecraft paid for free
mcmarket
mc-market
free minecraft paid plugins
free minecraft plugins
spigotmc
SpigotMC
aac free
ewg free
Minecraft Premium Plugins
ewg free download
litebans free
epicworldgenerator free
free schematics
leaked schematics minecraft
schematics
schematics leaked
schematics free
minecraft schematics free
paid minecraft schematics free
paid minecraft schematics for free
free cracked plugins
free cracked minecraft plugins
plugins
featherboard download
featherboard plugin download
antiaura download
xenforo leaked
xenforo for free
xenforo addons