diff --git a/IJPay-Core/src/main/java/com/ijpay/core/kit/WxPayKit.java b/IJPay-Core/src/main/java/com/ijpay/core/kit/WxPayKit.java
index 27b6e077af832e8717d79f7af0a3b51d3e245348..a812508d24bd5dbe0d0a2a8dcc3ddc581646420b 100644
--- a/IJPay-Core/src/main/java/com/ijpay/core/kit/WxPayKit.java
+++ b/IJPay-Core/src/main/java/com/ijpay/core/kit/WxPayKit.java
@@ -669,9 +669,12 @@ public class WxPayKit {
                         nonceStr.getBytes(StandardCharsets.UTF_8),
                         cipherText
                 );
-            }
-        }
-        return null;
+            }else {
+				throw new Exception("签名错误");
+			}
+        }else {
+        	throw new Exception("证书序列号错误");
+		}
     }
 
     /**