diff --git a/src/main/java/org/bdware/sc/ContractStatusRecorder.java b/src/main/java/org/bdware/sc/ContractStatusRecorder.java
index 3a595f2..5f47f1c 100644
--- a/src/main/java/org/bdware/sc/ContractStatusRecorder.java
+++ b/src/main/java/org/bdware/sc/ContractStatusRecorder.java
@@ -229,7 +229,9 @@ public class ContractStatusRecorder extends StatusRecorder<ContractMeta> {
             ContractManager.instance.invokeContractSuicide(client);
             ContractManager.cPort.updateDb(client.port, false);
         }
-        meta.contractExecutor.close();
+        if (null != meta.contractExecutor) {
+            meta.contractExecutor.close();
+        }
         id2ContractClient.remove(meta.id);
         runningProcess.remove(meta);
         return "success";