diff --git a/.gitea/workflows/main.yml b/.gitea/workflows/main.yml
index 299da48..c59ce09 100644
--- a/.gitea/workflows/main.yml
+++ b/.gitea/workflows/main.yml
@@ -2,7 +2,7 @@
 name: Run Report Table
 on:
   schedule:
-    - cron: "11 4 * * *"
+    - cron: "18 4 * * *"
 jobs:
   run-script:
     runs-on: ubuntu-latest
diff --git a/src/services/reporter.py b/src/services/reporter.py
index 9f58f18..2f985a7 100644
--- a/src/services/reporter.py
+++ b/src/services/reporter.py
@@ -1,27 +1,31 @@
-import logging
-from typing import List
-
-import requests
-
-logger = logging.getLogger(__name__)
-
-
-def post_mattermost(webhook: str, lines: List[str]) -> None:
-    """
-    Mattermost Webhook으로 메시지 전송.
-    """
-    payload = {
-        "username": "Grafana Reporter",
-        "icon_url": "https://grafana.com/static/assets/img/fav32.png",
-        "text": "\n".join(lines),
-    }
-    logger.info(f"[MATTERMOST POST] url={webhook}")
-    logger.info(f"[MATTERMOST PAYLOAD] {payload}")
-
-    try:
-        r = requests.post(webhook, json=payload, timeout=30)
-        r.raise_for_status()
-        logger.info(f"[MATTERMOST STATUS] {r.status_code}")
-    except Exception as e:
-        logger.exception(f"[MATTERMOST ERROR] {e}")
-        raise
+import logging
+from typing import List
+
+import requests
+
+logger = logging.getLogger(__name__)
+
+
+def post_mattermost(webhook: str, lines: List[str]) -> None:
+    """
+    Mattermost Webhook으로 메시지 전송.
+    """
+    if not webhook:
+        logger.error("[MATTERMOST ERROR] Webhook URL is not configured.")
+        return
+
+    payload = {
+        "username": "Grafana Reporter",
+        "icon_url": "https://grafana.com/static/assets/img/fav32.png",
+        "text": "\n".join(lines),
+    }
+    logger.info(f"[MATTERMOST POST] url={webhook}")
+    logger.info(f"[MATTERMOST PAYLOAD] {payload}")
+
+    try:
+        r = requests.post(webhook, json=payload, timeout=30)
+        r.raise_for_status()
+        logger.info(f"[MATTERMOST STATUS] {r.status_code}")
+    except Exception as e:
+        logger.exception(f"[MATTERMOST ERROR] {e}")
+        raise