diff --git a/google/cloud/dataproc_spark_connect/session.py b/google/cloud/dataproc_spark_connect/session.py
index d1e3570..2fd2211 100644
--- a/google/cloud/dataproc_spark_connect/session.py
+++ b/google/cloud/dataproc_spark_connect/session.py
@@ -592,6 +592,16 @@ def getOrCreate(self) -> "DataprocSparkSession":
                     session = PySparkSQLSession.builder.getOrCreate()
                     return session  # type: ignore
 
+                if self._project_id is None:
+                    raise DataprocSparkConnectException(
+                        f"Error while creating Dataproc Session: project ID is not set"
+                    )
+
+                if self._region is None:
+                    raise DataprocSparkConnectException(
+                        f"Error while creating Dataproc Session: location is not set"
+                    )
+
                 # Handle custom session ID by setting it early and letting existing logic handle it
                 if self._custom_session_id:
                     self._handle_custom_session_id()
diff --git a/tests/unit/test_session.py b/tests/unit/test_session.py
index d75c8ce..703276f 100644
--- a/tests/unit/test_session.py
+++ b/tests/unit/test_session.py
@@ -1471,9 +1471,31 @@ def test_create_session_with_valid_notebook_id(
             )
             self.stopSession(mock_session_controller_client_instance, session)
 
+    def test_create_session_without_project_id(self):
+        """Tests that an exception is raised when project ID is not provided."""
+        os.environ.clear()
+        try:
+            DataprocSparkSession.builder.location("test-region").getOrCreate()
+        except DataprocSparkConnectException as e:
+            self.assertIn("project ID is not set", str(e))
+
+    def test_create_session_without_location(self):
+        """Tests that an exception is raised when location is not provided."""
+        os.environ.clear()
+        try:
+            DataprocSparkSession.builder.projectId("test-project").getOrCreate()
+        except DataprocSparkConnectException as e:
+            self.assertIn("location is not set", str(e))
+
 
 class DataprocSparkConnectClientTest(unittest.TestCase):
 
+    def setUp(self):
+        self.original_environment = dict(os.environ)
+        os.environ.clear()
+        os.environ["GOOGLE_CLOUD_PROJECT"] = "test-project"
+        os.environ["GOOGLE_CLOUD_REGION"] = "test-region"
+
     @staticmethod
     def stopSession(mock_session_controller_client_instance, session):
         session_response = Session()