diff --git a/ops/alert_on_session_errors/README.md b/ops/alert_on_session_errors/README.md
index 898abb3..deb8b73 100644
--- a/ops/alert_on_session_errors/README.md
+++ b/ops/alert_on_session_errors/README.md
@@ -22,17 +22,19 @@ to look for sessions that ended with an error status in the previous minute.
 
 1. Generate a personal API auth token in the web UI:
 
-   1. Click your user icon in the bottom-left corner of the page
-   2. Click the "Client Setup" menu option to go to that page
-   3. Click the "Generate Token" button, and copy the generated
-      [JWT](https://jwt.io/)
+   - Click your user icon in the bottom-left corner of the page
+   - Click the "Client Setup" menu option to go to that page
+   - Click the "Generate Token" button, and copy the generated
+     [JWT](https://jwt.io/)
 
 2. Import/upload the project
 3. Initialize your connections
 4. Set/modify these project variables:
 
-   - `AUTOKITTEH_API_BASE_URL` (default = `https://api.autokitteh.cloud`)
-   - `AUTOKITTEH_UI_BASE_URL` (default = `https://app.autokitteh.cloud`)
+   - `AUTOKITTEH_API_BASE_URL` (default = `https://api.autokitteh.cloud`,
+     use `http://localhost:9980` for self-hosted servers)
+   - `AUTOKITTEH_UI_BASE_URL` (default = `https://app.autokitteh.cloud`,
+     use `http://localhost:9982` for self-hosted servers)
    - `AUTOKITTEH_AUTH_TOKEN`: the API auth token generated in step 1 above
    - `SLACK_CHANNEL`: send alert messages to this Slack channel name/ID
      (default = `autokitteh-alerts`)
diff --git a/ops/alert_on_session_errors/program.py b/ops/alert_on_session_errors/program.py
index 1007233..12f9f00 100644
--- a/ops/alert_on_session_errors/program.py
+++ b/ops/alert_on_session_errors/program.py
@@ -13,8 +13,8 @@
 from requests import exceptions
 
 
-API_BASE_URL = os.getenv("AUTOKITTEH_API_BASE_URL", "https://api.autokitteh.cloud")
-UI_BASE_URL = os.getenv("AUTOKITTEH_UI_BASE_URL", "https://app.autokitteh.cloud")
+API_BASE_URL = os.getenv("AUTOKITTEH_API_BASE_URL", "")
+UI_BASE_URL = os.getenv("AUTOKITTEH_UI_BASE_URL", "")
 JWT = os.getenv("AUTOKITTEH_AUTH_TOKEN", "")
 SLACK_CHANNEL = os.getenv("SLACK_CHANNEL", "")
 
@@ -44,8 +44,7 @@ def _list_sessions_with_errors():
 
     resp = requests.post(url, headers=headers, json={"stateType": 3}, timeout=10)
     print(f"API call's Round Trip Time: {resp.elapsed}")
-    if not resp.ok:
-        resp.raise_for_status()
+    resp.raise_for_status()
 
     try:
         return resp.json().get("sessions", [])