diff --git a/core/general-server/op/general_infer_op.cpp b/core/general-server/op/general_infer_op.cpp
index c12ca25c048d1bd7f80aff31eefe8ed1ac9eeadb..07405a783fe235831b419d3c5008072a0fb72564 100644
--- a/core/general-server/op/general_infer_op.cpp
+++ b/core/general-server/op/general_infer_op.cpp
@@ -122,6 +122,7 @@ int GeneralInferOp::inference() {
         }
       }
     }
+    var_idx++;
   }
   return 0;
 }