diff --git a/keep/api/models/alert.py b/keep/api/models/alert.py
index 30d2d1c8f..01319ac44 100644
--- a/keep/api/models/alert.py
+++ b/keep/api/models/alert.py
@@ -287,7 +287,8 @@ def set_default_values(cls, values: Dict[str, Any]) -> Dict[str, Any]:
             values["lastReceived"] = lastReceived
 
         assignees = values.pop("assignees", None)
-        if assignees:
+        # In some cases (for example PagerDuty) the assignees is list of dicts and we don't handle it atm.
+        if assignees and isinstance(assignees, dict):
             dt = datetime.datetime.fromisoformat(lastReceived)
             dt.isoformat(timespec="milliseconds").replace("+00:00", "Z")
             assignee = assignees.get(lastReceived) or assignees.get(dt)
diff --git a/keep/identitymanager/authverifierbase.py b/keep/identitymanager/authverifierbase.py
index 0e07a934b..627727143 100644
--- a/keep/identitymanager/authverifierbase.py
+++ b/keep/identitymanager/authverifierbase.py
@@ -228,7 +228,7 @@ def _extract_api_key(
             if (
                 not authorization
                 and "Amazon Simple Notification Service Agent"
-                in request.headers.get("user-agent")
+                in request.headers.get("user-agent", "")
             ):
                 self.logger.warning("Got an SNS request without any auth")
                 raise HTTPException(
diff --git a/keep/providers/pagerduty_provider/pagerduty_provider.py b/keep/providers/pagerduty_provider/pagerduty_provider.py
index c9bde1e60..8d4e8044f 100644
--- a/keep/providers/pagerduty_provider/pagerduty_provider.py
+++ b/keep/providers/pagerduty_provider/pagerduty_provider.py
@@ -311,7 +311,7 @@ def _format_alert(
     ) -> AlertDto:
         actual_event = event.get("event", {})
         data = actual_event.get("data", {})
-        url = data.pop("self", data.pop("html_url"))
+        url = data.pop("self", data.pop("html_url", None))
         # format status and severity to Keep format
         status = PagerdutyProvider.STATUS_MAP.get(
             data.pop("status"), AlertStatus.FIRING
@@ -336,7 +336,9 @@ def _format_alert(
 
         last_status_change_by = data.get("last_status_change_by", {}).get("summary")
         acknowledgers = [x.get("summary") for x in data.get("acknowledgers", [])]
-        conference_bridge = data.get("conference_bridge", {}).get("summary")
+        conference_bridge = data.get("conference_bridge", {})
+        if isinstance(conference_bridge, dict):
+            conference_bridge = conference_bridge.get("summary")
         urgency = data.get("urgency")
 
         # Additional metadata
diff --git a/keep/providers/sentry_provider/sentry_provider.py b/keep/providers/sentry_provider/sentry_provider.py
index 4f82e90ca..5a6d615d4 100644
--- a/keep/providers/sentry_provider/sentry_provider.py
+++ b/keep/providers/sentry_provider/sentry_provider.py
@@ -5,6 +5,7 @@
 import dataclasses
 import datetime
 import logging
+from urllib.parse import urlparse
 
 import pydantic
 import requests
@@ -258,6 +259,15 @@ def _format_alert(
             .replace('"', "")
         )
 
+        # Validate URL
+        if url:
+            try:
+                result = urlparse(url)
+                if not all([result.scheme, result.netloc]):
+                    url = None
+            except Exception:
+                url = None
+
         return AlertDto(
             id=event_data.pop("event_id"),
             name=name,