。。。

src/main/java/cn/com/qmth/examcloud/commons/helpers/pipeline/SimpleNode.java

@@ -131,7 +131,9 @@ public class SimpleNode<KEYIN, VALUEIN, KEYOUT, VALUEOUT>
 				}
 			}
 
-			getStorer().remove(key);
+			if (null != key) {
+				getStorer().remove(key);
+			}
 
 			counter.incrementSuccessAmount();