diff --git a/run.sh b/run.sh
index a7c482d..5e65ef8 100644
--- a/run.sh
+++ b/run.sh
@@ -3,13 +3,18 @@
 function run(){
   nohup yarn start &
 
-  pid=-1
-  while(( pid==-1 ))
+  while true
   do
-    sleep 1s
     pid=`findPortPid $webPort`
+    if [ pid -eq '' ]
+    then
+      echo pid not found!!!
+      sleep 1s
+    else
+      echo "pid is $pid"
+      break
   done
-  echo "pid is $pid"
+
   touch $pid.log && chmod +x $pid.log
 }