when set {x:Null} to any control's FontFamily property, application will crashed

[Luoyingliang]

Describe the bug

in WPF, set {x:Null} to any control's FontFamily property, it will fallback to the default fontfamily rather than throw exception, but in Avalonia (version 11.0.10) will throw a exception and application crashed

To Reproduce

set {x:Null} to any control's FontFamily property

Expected behavior

fallback to the default fontfamily

Avalonia version

11.0.10

OS

Windows, Linux, Android

Additional context

No response

[appel1]

Duplicate of #15287 ?

And perhaps setting FontFamily to null should fail property validation as it works in WPF?

[Luoyingliang]

Duplicate of #15287 ?

And perhaps setting FontFamily to null should fail property validation as it works in WPF?

yep, it's duplicated.
right, it's work in WPF

[rabbitism]

There are multiple RPs related to font loading now, so we probably need to ask @Gillibald to check if any previous PR already fixed this issue.

[Luoyingliang]

There are multiple RPs related to font loading now, so we probably need to ask @Gillibald to check if any previous PR already fixed this issue.

ok