Error on `get-text-property`

[guo . yong]

Hello.

I'm using `smartparens-mode` and it causes an erorr when I try to delete word 
when the kill ring is empty.

>From the backtrack, the error occured from `kill-append`. The reason is that 
>`kill-append` calls `get-text-property` in the function. But when the kill 
>ring is empty, the function call is `(get-text-property 0 'yank-handler nil)` 
>which cause the error.

I don't know Elisp well so I'm at lost. Is there any workaround for this 
problem or do I have to report this to Emacs devs (the functions are from 
`simple.el`)?

Regards.Yong.

P.S. This is my first time using mailing list. Sorry for the previous mail from 
me (https://lists.gnu.org/archive/html/help-gnu-emacs/2021-11/msg00415.html)