3 files changed, 16 insertions, 14 deletions

diff --git a/README.md b/README.md
index 3b0f016..2c275e4 100644
--- a/README.md
+++ b/README.md
@@ -7,19 +7,15 @@ Foursquare Swarm like Telegram bot to check in at places and post to Fediverse (
 - [x] Telegram native location venue checkin
 - [x] Telegram raw GPS location checkin
 - [x] Attach additional comments and medias (photos, up to 4) with checkins
-
-## TODO:
-
 - [x] OAuth2 login
-
     - Supported Fediverse software
-    - [x] Mastodon
-    - [x] Pleroma
-    - [ ] Misskey
+      - [x] Mastodon
+      - [x] Pleroma
 
+## TODO:
+ 
 - [ ] Option to set individual checkin visibility
 - [ ] Delayed checkins (Scheduled posts on Fediverse)
 - [ ] Connect multiple Fediverse accounts
 - [ ] add Telegram payment option to enable raw GPS checkins
-- [ ] i18n
 - [ ] Anonymized usage analysis, monitoring (Grafana/Prometheus)
diff --git a/callback.py b/callback.py
index cb6a8d3..7530afb 100644
--- a/callback.py
+++ b/callback.py
@@ -82,12 +82,16 @@ async def process_media_group(context: CallbackContext):
 
 async def callback_generate_fedi_login_url(update: Update, context: ContextTypes.DEFAULT_TYPE) -> int:
     home_instance = update.effective_message.text
-    client_id, client_secret = Mastodon.create_app(
-        "Checkin.bot",
-        scopes=BOT_SCOPE,
-        redirect_uris="{}{}".format(BOT_DOMAIN, FEDI_LOGIN_CALLBACK_URL),
-        api_base_url=home_instance,
-    )
+    try:
+        client_id, client_secret = Mastodon.create_app(
+            "Checkin.bot",
+            scopes=BOT_SCOPE,
+            redirect_uris="{}{}".format(BOT_DOMAIN, FEDI_LOGIN_CALLBACK_URL),
+            api_base_url=home_instance,
+        )
+    except KeyError as e:
+        await update.message.reply_text(PROMPT_INVALID_INSTANCE)
+        return FEDI_LOGIN
 
     m = Mastodon(client_id=client_id, client_secret=client_secret, api_base_url=home_instance)
 
diff --git a/prompt/string.py b/prompt/string.py
index 2fe13f6..e60085c 100644
--- a/prompt/string.py
+++ b/prompt/string.py
@@ -20,6 +20,8 @@ By using this bot, you agree to the following terms of service:\n\n
 
 PROMPT_FEDI_LOGIN_WHERE_IS_INSTANCE = "Where is your home instance in the Fediverse? (e.g. `https://mastodon.social`)"
 PROMPT_FEDI_LOGIN = "Please login to your Fediverse account by clicking the link below:"
+PROMPT_INVALID_INSTANCE = "Your home instance (Probably a Misskey or GotoSocial instance?) is not supported. " \
+                          "Currently, only Mastodon or Pleroma instances are supported."
 PROMPT_CHOOSE_ACTION = "Use bot keyboard to choose an action"
 PROMPT_ADD_COMMENT = "You can continue adding comments, or press skip"
 PROMPT_ADD_MEDIA = "You can continue adding photos, or press skip"