diff --git a/apps/enm/services.py b/apps/enm/services.py
index 9a68e374..52af8419 100644
--- a/apps/enm/services.py
+++ b/apps/enm/services.py
@@ -27,10 +27,8 @@ def translate_eval_formula(exp_str: str, year: int, month: int, day: int, hour:
     matches = re.findall(pattern, exp_str)
     for match in matches:
         mpst = MpointStat.objects.filter(Q(mpoint__id=match) | Q(mpoint__name=match) | Q(mpoint__code=match), type="hour", year=year, month=month, day=day, hour=hour).first()
-        val = 0
         if mpst:
-            val = mpst.val
-        exp_str = exp_str.replace(f"${{{match}}}", str(val))
+            exp_str = exp_str.replace(f"${{{match}}}", str(mpst.val))
     rval = eval(exp_str)
     return rval