Error when installing platform via CLI when it is already installed

[patrickelectric]

Using Arduino IDE 1.8.14 Hourly Build 2021/03/09 09:33

I think that the program should not terminate with a crash !

java.lang.Exception: Platform is already installed!
	at cc.arduino.contributions.packages.ContributionInstaller.install(ContributionInstaller.java:78)
	at processing.app.Base.<init>(Base.java:323)
	at processing.app.Base.main(Base.java:144)

[matthijskooijman]

Can you provide a bit more details on what you did to obtain this error? Is it reproducible?

[patrickelectric]

I run this command more than once.

arduino --pref boardsmanager.additional.urls="http://arduino.esp8266.com/stable/package_esp8266com_index.json" --save-prefs
arduino --install-boards esp8266:esp8266