fcitx-dbus-watcher crashed with SIGSEGV in dbus_watch_get_enabled()

I'm using Lubuntu 20.04 Full crash report here: https://errors.ubuntu.com/oops/4d12ba38-7579-11ec-824e-fa163ee63de6

== Stacktrace =================================
#0 0x00007fd20b1ad0a9 in dbus_watch_get_enabled () from /lib/x86_64-linux-gnu/libdbus-1.so.3
No symbol table info available.
#1 0x000056137d9b3985 in ?? ()
No symbol table info available.
#2 0x000056137d9b361d in ?? ()
No symbol table info available.
#3 0x00007fd20af9f0b3 in __libc_start_main (main=0x56137d9b3400, argc=3, argv=0x7ffde1a72068, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffde1a72058) at ../csu/libc-start.c:308
        self = <optimised out>
        result = <optimised out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {94641711692720, 3739136921760942169, 94641711691360, 140728389279840, 0, 0, -3738033363213367207, -3728979616013629351}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x3, 0x7ffde1a72068}, data = {prev = 0x0, cleanup = 0x0, canceltype = 3}}}
        not_first_call = <optimised out>
#4 0x000056137d9b368e in ?? ()
No symbol table info available.

== StacktraceAddressSignature =================================
/usr/bin/fcitx-dbus-watcher:11:/usr/lib/x86_64-linux-gnu/libdbus-1.so.3.19.11+220a9:/usr/bin/fcitx-dbus-watcher+985:/usr/bin/fcitx-dbus-watcher+61d:/usr/lib/x86_64-linux-gnu/libc-2.31.so+20b3:/usr/bin/fcitx-dbus-watcher+68e

== StacktraceTop =================================
dbus_watch_get_enabled () from /lib/x86_64-linux-gnu/libdbus-1.so.3
?? ()
?? ()
__libc_start_main (main=0x56137d9b3400, argc=3, argv=0x7ffde1a72068, init=<optimised out>, fini=<optimised out>, rtld_fini=<optimised out>, stack_end=0x7ffde1a72058) at ../csu/libc-start.c:308
?? ()