There is a trigger which converts the lead when user selects particular status. It works great in classic version, but when I tried it in lightning UI, the screen gets hung-up (not progressing anywhere). If I refresh/reload the page, it lands on lead conversion page, stating this lead has been converted to particular contact. I couldn't figure out why it hangs inbetween. Any help is greatly appreciated.

There is a trigger which converts the lead when user selects particular status. It works great in classic version, but when I tried it in lightning UI, the screen gets hung-up (not progressing anywhere). If I refresh/reload the page, it lands on lead conversion page, stating this lead has been converted to particular contact. I couldn't figure out why it hangs inbetween. Any help is greatly appreciated.