Geary segfault & invalid locale

Code:
[manjaro@manjaro-arm ~]$ geary

*[wrn] 15:27:17.0698 Gtk:Locale not supported by C library.

Using the fallback 'C' locale.

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_MESSAGES to default locale: No such file or directory

locale: Cannot set LC_COLLATE to default locale: No such file or directory

*[wrn] 15:27:19.0987 folks:backend-store.vala:435: Error preparing Backend 'telepathy': The name org.freedesktop.Telepathy.AccountManager was not provided by any .service files

![crt] 15:27:20.0155 Gtk:Error building template class 'ApplicationMainWindow' for an instance of type 'ApplicationMainWindow': Unknown internal child: action_area

Segmentation fault (core dumped)

[manjaro@manjaro-arm ~]$ localectl status

  System Locale: LANG=en_US.UTF-8

      VC Keymap: n/a

      X11 Layout: n/a

[manjaro@manjaro-arm ~]$ locale

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_MESSAGES to default locale: No such file or directory

locale: Cannot set LC_ALL to default locale: No such file or directory

LANG=C.UTF-8

LC_CTYPE="C.UTF-8"

LC_NUMERIC="C.UTF-8"

LC_TIME="C.UTF-8"

LC_COLLATE="C.UTF-8"

LC_MONETARY="C.UTF-8"

LC_MESSAGES="C.UTF-8"

LC_PAPER="C.UTF-8"

LC_NAME="C.UTF-8"

LC_ADDRESS="C.UTF-8"

LC_TELEPHONE="C.UTF-8"

LC_MEASUREMENT="C.UTF-8"

LC_IDENTIFICATION="C.UTF-8"

LC_ALL=

[manjaro@manjaro-arm ~]$ locale -a

locale: Cannot set LC_CTYPE to default locale: No such file or directory

locale: Cannot set LC_MESSAGES to default locale: No such file or directory

locale: Cannot set LC_COLLATE to default locale: No such file or directory

C

POSIX

cs_CZ.utf8

da_DK.utf8

de_AT.utf8

de_DE.utf8

en_GB.utf8

en_US.utf8

es_ES.utf8

es_MX.utf8

fr_BE.utf8

fr_FR.utf8

it_IT.utf8

ro_RO.utf8

ru_RU.utf8

ru_UA.utf8

sk_SK.utf8

sv_FI.utf8

sv_SE.utf8

tr_CY.utf8

tr_TR.utf8

zh_CN.utf8

zh_HK.utf8

zh_SG.utf8

zh_TW.utf8

[manjaro@manjaro-arm ~]$ cat /etc/locale.conf 

LANG=en_US.UTF-8