diff --git a/src/main/java/org/bdware/sc/ContractManager.java b/src/main/java/org/bdware/sc/ContractManager.java
index 6a09641..4ba4203 100644
--- a/src/main/java/org/bdware/sc/ContractManager.java
+++ b/src/main/java/org/bdware/sc/ContractManager.java
@@ -1295,13 +1295,19 @@ public class ContractManager {
 
         long start = System.currentTimeMillis();
         // 9000
-
         if (client.contractMeta.sigRequired) {
             if (!request.verifySignature()) {
                 cr = new ContractResult(Status.Error, new JsonPrimitive("sign verified failed"));
                 rcb.onResult(JsonUtil.parseObjectAsJsonObject(cr));
                 return;
             }
+        } else {
+            if (request.getPublicKey() != null) {
+                if (!request.verifySignature()) {
+                    request.setPublicKey(null);
+                    request.setRequester(null);
+                }
+            }
         }
         client.times++;
         client.contractStatus = ContractStatus.Executing;
@@ -1358,6 +1364,13 @@ public class ContractManager {
                 cr = new ContractResult(Status.Error, new JsonPrimitive("sign verified failed"));
                 return JsonUtil.toJson(cr);
             }
+        } else {
+            if (request.getPublicKey() != null) {
+                if (!request.verifySignature()) {
+                    request.setPublicKey(null);
+                    request.setRequester(null);
+                }
+            }
         }
         client.times++;
         // 将合约状态改为“Executing”