diff --git a/web/pgadmin/authenticate/oauth2.py b/web/pgadmin/authenticate/oauth2.py
index 4e04b5b23be..806744619b7 100644
--- a/web/pgadmin/authenticate/oauth2.py
+++ b/web/pgadmin/authenticate/oauth2.py
@@ -744,8 +744,8 @@ def get_user_profile(self):
 
         # For non-OIDC providers or when ID token is insufficient,
         # call the userinfo endpoint
-        if 'OAUTH2_USERINFO_ENDPOINT' not in self.oauth2_config[
-                self.oauth2_current_client]:
+        if not self.oauth2_config[
+                self.oauth2_current_client].get('OAUTH2_USERINFO_ENDPOINT'):
             if self._is_oidc_provider():
                 # OIDC provider should have provided claims in ID token
                 current_app.logger.warning(
diff --git a/web/pgadmin/authenticate/tests/test_oauth2_userinfo_endpoint.py b/web/pgadmin/authenticate/tests/test_oauth2_userinfo_endpoint.py
new file mode 100644
index 00000000000..65df0beaa68
--- /dev/null
+++ b/web/pgadmin/authenticate/tests/test_oauth2_userinfo_endpoint.py
@@ -0,0 +1,59 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2026, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+"""Verify that an OAUTH2_USERINFO_ENDPOINT of None (the shipped config
+template default) is treated the same as an absent key, rather than being
+passed to the HTTP client and crashing (issue #10349).
+"""
+
+import sys
+from unittest.mock import MagicMock, patch
+
+from pgadmin.utils.route import BaseTestGenerator
+
+
+class OAuth2UserinfoEndpointNoneTestCase(BaseTestGenerator):
+    """Exercises get_user_profile() directly - no server connection needed."""
+
+    def setUp(self):
+        pass
+
+    def runTest(self):
+        # Resolved at call time, rather than imported at module load time:
+        # test_auth_gating (run earlier in this same package) deliberately
+        # forces pgadmin.authenticate.oauth2 to be re-imported, which would
+        # leave a module-level import here bound to a stale module object
+        # whose globals patch('...session', ...) below wouldn't reach.
+        oauth2_module = sys.modules['pgadmin.authenticate.oauth2']
+        OAuth2Authentication = oauth2_module.OAuth2Authentication
+
+        auth = OAuth2Authentication.__new__(OAuth2Authentication)
+        auth.oauth2_current_client = 'test_provider'
+        auth.oauth2_config = {
+            'test_provider': {
+                'OAUTH2_NAME': 'test_provider',
+                # Shipped config.py template default - key present, not set.
+                'OAUTH2_USERINFO_ENDPOINT': None,
+            }
+        }
+        mock_client = MagicMock()
+        auth.oauth2_clients = {'test_provider': mock_client}
+
+        with self.app.app_context(), \
+                patch.object(auth, '_authorize_access_token',
+                             return_value={'access_token': 'tok'}), \
+                patch.object(auth, '_is_oidc_provider',
+                             return_value=False), \
+                patch('pgadmin.authenticate.oauth2.session', {}):
+            profile = auth.get_user_profile()
+
+        self.assertEqual(profile, {})
+        # The bug: client.get(None) raised requests.exceptions.MissingSchema
+        # instead of skipping the call.
+        mock_client.get.assert_not_called()