diff --git a/dapr/ext/workflow/dapr_workflow_client.py b/dapr/ext/workflow/dapr_workflow_client.py
index 96a8d9c33..975c5c292 100644
--- a/dapr/ext/workflow/dapr_workflow_client.py
+++ b/dapr/ext/workflow/dapr_workflow_client.py
@@ -189,7 +189,7 @@ def get_workflow_state(
             )
             return WorkflowState(state) if state else None
         except RpcError as error:
-            if 'no such instance exists' in error.details():
+            if error.details() and 'no such instance exists' in error.details():
                 self._logger.warning(f'Workflow instance not found: {instance_id}')
                 return None
             self._logger.error(
diff --git a/tests/ext/workflow/test_workflow_client.py b/tests/ext/workflow/test_workflow_client.py
index c19eb6a74..10461c4b6 100644
--- a/tests/ext/workflow/test_workflow_client.py
+++ b/tests/ext/workflow/test_workflow_client.py
@@ -77,6 +77,8 @@ def get_orchestration_state(self, instance_id, fetch_payloads, app_id=None):
             return self._inner_get_orchestration_state(
                 instance_id, client.OrchestrationStatus.PENDING
             )
+        elif wf_status == 'no-details':
+            raise SimulatedRpcError(code='UNAVAILABLE', details=None)
         else:
             raise SimulatedRpcError(code='UNKNOWN', details='unknown error')
 
@@ -274,6 +276,10 @@ def test_client_functions(self):
 
             assert actual_get_result is None
 
+            wf_status = 'no-details'
+            with self.assertRaises(RpcError):
+                wfClient.get_workflow_state(instance_id=mock_instance_id, fetch_payloads=True)
+
             wf_status = 'found'
             actual_get_result = wfClient.get_workflow_state(
                 instance_id=mock_instance_id, fetch_payloads=True