diff --git a/server/web3server/blockchain.js b/server/web3server/blockchain.js
index 1d6c4d0..996a295 100644
--- a/server/web3server/blockchain.js
+++ b/server/web3server/blockchain.js
@@ -54,10 +54,10 @@ class BlockChain {
         }
         this.lastRefreshBlockNumberTime = utils.getUtcTime();
       } catch (e) {
-        log.warning(util.format('%s err:%s', {
-          logClass,
-          e
-        }));
+        log.warning(util.format('%s err:%s',
+                                logClass,
+                                e
+                               ));
       }
       await this.refreshBlockNumberCond.wait(1000 * 3);
     }