Stop console button greyed out - PyCharm 2018.1

Hello,

I have just started using PyCharm professional 2018.1.4 in scientific mode. However whenever I execute anything in the Python Console my Stop button is greyed out (pressing Ctrl + F2 doesn't work either) and the only way to interrupt is to restart the kernel - which means I have to re-run everything from scratch. Does anyone have any idea why this is? I'm used to using Spyder where usually I can just stop something running and carry on with all my data saved.

Thanks,

Mark