diff --git a/apps/enm/services.py b/apps/enm/services.py
index 0631d684..f5c234dc 100644
--- a/apps/enm/services.py
+++ b/apps/enm/services.py
@@ -177,10 +177,9 @@ class MpointCache:
         current_cache_val = self.data
         cache_key = self.cache_key
         last_data = current_cache_val["last_data"]
-        if last_val:
-            last_data["last_val"] = last_val*current_cache_val.get('coefficient', 1.0)
-        else:
-            last_data["last_val"] = last_val
+        if isinstance(last_val, (int, float)):
+            last_val = last_val*current_cache_val.get('coefficient', 1.0)
+        last_data["last_val"] = last_val
         last_data["last_timex"] = last_timex
         last_mrs = None  # 设备状态信号
         mpoint_is_rep_ep_running_state = current_cache_val["is_rep_ep_running_state"]