fixbug

@@ -329,7 +329,6 @@ public abstract class AbstractWeixinPayService extends AbstractPayService {
             log.error("[{}] valid prepay response failed", orderInfo.getOrderCode());
             return null;
         }
-
         JSONObject prepayJson = getPrepayData(requestParams, reponseMap);
         log.info("[{}] response prepayData: {}", orderInfo.getOrderCode(), prepayJson);
         return prepayJson;
@@ -494,6 +493,9 @@ public abstract class AbstractWeixinPayService extends AbstractPayService {
 
 
     public boolean verifySign(Map<String, String> paramsMap) {
+        if (paramsMap == null) {
+            return false;
+        }
         return verifySign(paramsMap, paramsMap.get(WeixinPayConfig.ApiConstants.SIGN_TYPE));
     }