diff --git a/src/main/java/com/loafle/overflow/central/proxy/ServiceInvoker.java b/src/main/java/com/loafle/overflow/central/proxy/ServiceInvoker.java
index 71e9e9c..33aa559 100644
--- a/src/main/java/com/loafle/overflow/central/proxy/ServiceInvoker.java
+++ b/src/main/java/com/loafle/overflow/central/proxy/ServiceInvoker.java
@@ -128,7 +128,6 @@ public class ServiceInvoker {
       }
     }
     return objectMapper.convertValue(json, targetType);
-
   }
 
   private Object[] getParameters(Type[] parameterTypes, List<ByteString> params) throws IllegalArgumentException {
@@ -188,7 +187,7 @@ public class ServiceInvoker {
     try {
       jsonInString = objectMapper.writeValueAsString(result);
     } catch (IOException e) {
-      throw new OverflowException("InternalError");
+      throw new OverflowException("InternalError", e);
     }
 
     return jsonInString;