App-Manager hangs during installing custom app via command line/admin site.

In my install script for my Custom App I take some post install actions. However until I upgraded the Conduit firmware to 5.2.1, I never got any errors. However since I upgraded to 5.2.1 I get the following error indicated below as a result of running the following post install commands. What is weird is that even though the app-manager seems to hang and I have to force exit at the command prompt and if I go into the file system of the conduit via win-scp, I see all the necessary files have been installed, however if I login to the conduit admin site, the custom app isn’t listed on the app’s page. Here is what is run in the post install script.

# postinstall is invoked by app-manager immediately after installing a custom app.
  postinstall)
      msg="Updating the custom app launch priority on post install!"
      echo -n $msg
      logger -t Install $msg
      #update the custom app, to launch before the lora-wan-server service.
      update-rc.d -f customapp remove
      update-rc.d customapp defaults 79 1

Error I get when the update-rc.d remove command is executed:
update-rc.d: /etc/init.d/customapp exists during rc.d purge (continuing)

Also to make it worse if I try and install the custom app via the admin site, since its a new addition thru’ the app’s page in 5.2.1 conduit firmware, the web site hangs and if I exit out of the browser, I can’t seem to log back in and the web site browser just says connecting and never is able to connect.

So I rebooted the Conduit and now everything works fine, the custom app is now listed out in the app’s page. So what changed in the latest conduit firmware, that the app-manager seems to hang while installing the custom app either via the command prompt or via the admin app’s page?

Thanks,
Ajay.