puppeteer makes script to hang for a while at the end

I am using npm:puppeteernpm:puppeteer in my script. Everything is working fine. But often the script hangs at the end of the exit. Is this normal with puppeteer?

I think that some async op is leaking. But I am not sure if I made any mistake or it is coming from puppeteer. I do call browser.close()browser.close() in a finallyfinally block.