"Undeployed pin" Alire bug detected

[reznikmm]

Describe the bug
If you pin a crate twice alire crashes with "Alire bug detected". I consider this as minor bug.

To Reproduce

alr init --bin ttt
alr -C ttt with libhello --use=https://github.com/alire-project/libhello
alr -C ttt with libhello --use=https://github.com/alire-project/libhello

error: ******************* BEGIN Alire bug detected *******************
error: Location  : 0xda582a Alire.User_Pins.Path at alire-user_pins.adb:333
error: Extra info: Undeployed pin
error: Report at : https://github.com/alire-project/alire/issues/new?title=[Bug%20box]
error: Re-run with `-vv -d` for a full log and stack trace.
error: ******************** END Alire bug detected ********************

Expected Behavior
There should be no crash.

alr version
2.0.2+9b80158

alr logs

error: ******************* BEGIN Alire bug detected *******************
error: Location  : 0xda582a Alire.User_Pins.Path at alire-user_pins.adb:333
error: Extra info: Undeployed pin
error: Report at : https://github.com/alire-project/alire/issues/new?title=[Bug%20box]
error: Re-run with `-vv -d` for a full log and stack trace.
error: ******************** END Alire bug detected ********************