diff --git a/api/chalicelib/core/collaboration_msteams.py b/api/chalicelib/core/collaboration_msteams.py
index cea284cd8..b94cc42f9 100644
--- a/api/chalicelib/core/collaboration_msteams.py
+++ b/api/chalicelib/core/collaboration_msteams.py
@@ -26,17 +26,23 @@ class MSTeams(BaseCollaboration):
 
     @classmethod
     def say_hello(cls, url):
-        r = requests.post(
-            url=url,
-            json={
-                "@type": "MessageCard",
-                "@context": "https://schema.org/extensions",
-                "summary": "Welcome to OpenReplay",
-                "title": "Welcome to OpenReplay"
-            })
-        if r.status_code != 200:
-            logger.warning("MSTeams integration failed")
-            logger.warning(r.text)
+        try:
+            r = requests.post(
+                url=url,
+                json={
+                    "@type": "MessageCard",
+                    "@context": "https://schema.org/extensions",
+                    "summary": "Welcome to OpenReplay",
+                    "title": "Welcome to OpenReplay"
+                },
+                timeout=3)
+            if r.status_code != 200:
+                logger.warning("MSTeams integration failed")
+                logger.warning(r.text)
+                return False
+        except Exception as e:
+            logger.warning("!!! MSTeams integration failed")
+            logger.exception(e)
             return False
         return True
 
diff --git a/api/chalicelib/core/sessions.py b/api/chalicelib/core/sessions.py
index d683f7b6f..1b93b5c89 100644
--- a/api/chalicelib/core/sessions.py
+++ b/api/chalicelib/core/sessions.py
@@ -336,10 +336,13 @@ def search2_table(data: schemas.SessionsSearchPayloadSchema, project_id: int, de
                     if v not in extra_conditions[e.operator].value:
                         extra_conditions[e.operator].value.append(v)
         extra_conditions = list(extra_conditions.values())
-
     elif metric_of == schemas.MetricOfTable.ISSUES and len(metric_value) > 0:
         data.filters.append(schemas.SessionSearchFilterSchema(value=metric_value, type=schemas.FilterType.ISSUE,
                                                               operator=schemas.SearchEventOperator.IS))
+    elif metric_of == schemas.MetricOfTable.REFERRER:
+        data.filters.append(schemas.SessionSearchFilterSchema(value=metric_value, type=schemas.FilterType.REFERRER,
+                                                              operator=schemas.SearchEventOperator.IS_ANY))
+
     full_args, query_part = search_query_parts(data=data, error_status=None, errors_only=False,
                                                favorite_only=False, issue=None, project_id=project_id,
                                                user_id=None, extra_event=extra_event, extra_conditions=extra_conditions)
diff --git a/api/schemas/schemas.py b/api/schemas/schemas.py
index 985bb1d7a..34f49d2df 100644
--- a/api/schemas/schemas.py
+++ b/api/schemas/schemas.py
@@ -777,6 +777,9 @@ class SessionsSearchPayloadSchema(_TimedSchema, _PaginatedSchema):
         for f in values.get("filters", []):
             vals = []
             for v in f.get("value", []):
+                if f.get("type", "") == FilterType.DURATION.value \
+                        and not v.isnumeric():
+                    continue
                 if v is not None:
                     vals.append(v)
             f["value"] = vals
diff --git a/ee/api/chalicelib/core/sessions_exp.py b/ee/api/chalicelib/core/sessions_exp.py
index 3e6d1ec10..0654f03c7 100644
--- a/ee/api/chalicelib/core/sessions_exp.py
+++ b/ee/api/chalicelib/core/sessions_exp.py
@@ -450,6 +450,7 @@ def search2_table(data: schemas.SessionsSearchPayloadSchema, project_id: int, de
             elif metric_of == schemas.MetricOfTable.REFERRER:
                 main_col = "referrer"
                 extra_col = ", referrer"
+                extra_where = "WHERE isNotNull(referrer)"
             elif metric_of == schemas.MetricOfTable.FETCH:
                 main_col = "url_path"
                 extra_col = ", s.url_path"