diff --git a/src/config/svc-monitor/svc_monitor/snat_agent.py b/src/config/svc-monitor/svc_monitor/snat_agent.py
index c4ad117e5ff..3b57f1e5dfd 100644
--- a/src/config/svc-monitor/svc_monitor/snat_agent.py
+++ b/src/config/svc-monitor/svc_monitor/snat_agent.py
@@ -22,7 +22,7 @@ def audit_snat_instances(self):
         for si in ServiceInstanceSM.values():
             si_name = si.fq_name[-1]
             st_obj = ServiceTemplateSM.get(si.service_template)
-            if st_obj.params['service_type'] != "source-nat":
+            if st_obj == None or st_obj.params['service_type'] != "source-nat":
                 continue
             lr_uuid = si.logical_router
             lr = LogicalRouterSM.get(lr_uuid)