Error messages upon SIGTERM

[Cogitri]

Describe the bug
When sending SIGTERM to v-l-s it throws errors when quitting:

vala-language-server
vls-DEBUG: main.vala:223: Finished constructing
vls-DEBUG: main.vala:2412: shutting down...

(process:30965): GLib-GObject-WARNING **: 14:04:19.952: invalid (NULL) pointer instance

(process:30965): GLib-GObject-CRITICAL **: 14:04:19.952: g_signal_handlers_disconnect_matched: assertion 'G_TYPE_CHECK_INSTANCE (instance)' failed

Software
OS and version (e.g. Ubuntu 20.04): Alpine Linux Edge
Code editor (e.g. VSCode):
Vala Language Server (e.g. git commit, or PPA/AUR version): 0.48.0-alpha3
Vala version (valac --version): 0.48.3

To Reproduce

Steps to reproduce the behavior:

1. $ vala-language-server
2. $ killlall vala-language-server

[Prince781]

Fixed. Thanks for your report.