install/54521: sysinst segfaults on subsequent attempt to install

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>Number:         54521
>Category:       install
>Synopsis:       sysinst segfaults on subsequent attempt to install
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 02 14:15:00 +0000 2019
>Originator:     Sevan Janiyan
>Release:        HEAD
>Organization:
>Environment:
NetBSD 9.99.10 (INSTALL_ERLITE)
>Description:
sysinst segfaults on subsequent attempt to install after an aborted attempt which finished without performing any partition changes.
>How-To-Repeat:
Boot the install kernel on ERLITE, select a to install, continue, select disk (sd0?), specify the geometry if asked (use defaults?), edit the partition table, cancel, which results in an aborted install.
press inter to go back to main menu.
Attempt to install again, when asked shall we continue, say yes results in sysinst segfaulting.
>Fix: