Browser widget core dumps on Interactive 2.2

[0000-Admin0000]

The "Browser" widget, a public domain widget by Peter Shipley, core dumps on
Interactive UNIX 2.2 - here is the stack trace:

malloc(0x1ff4)   [malloc.c]
Xpermalloc(0xc)   [Quarks.c]
XrmStringToQuark(0x402cdd)   [Quarks.c]
XrmCompileResourceList(0x402708,0xd)   [Resources.c]
ObjectClassPartInitialize(0x402b38)   [Object.c]
CallClassPartInit(0x40bee4,0x402b38)   [Create.c]
CallClassPartInit(0x40bb3c,0x402b38)   [Create.c]
CallClassPartInit(0x4024a4,0x402b38)   [Create.c]
ClassInit(0x402b38)   [Create.c]
ClassInit(0x40159c)   [Create.c]
_XtCreate(0x401182,0,0x40159c,0x41c430,0x41b528,0x400dd8,8,0)   [Create.c]
XtCreateWidget(0x401182,0x40159c,0x41c430,0x400dd8,8)   [Create.c]
XtCreateManagedWidget(0x401182,0x40159c,0x41c430,0x400dd8,8)   [Create.c]
CreateLabelWidget(br=0x41c430)   [Browser.c:315]
Initialize(request=0x7ffffc08,new=0x41c430)   [Browser.c:258]
CallInitialize(0x400d04,0x7ffffc08,0x41c430,0x415d30,7)   [Create.c]
_XtCreate(0x401519,0,0x400d04,0x41c22c,0x41b528,0x415d30,7,0)   [Create.c]
XtCreateWidget(0x401519,0x400d04,0x41c22c,0x415d30,7)   [Create.c]
XtCreateManagedWidget(0x401519,0x400d04,0x41c22c,0x415d30,7)   [Create.c]
main(argc=1,argv=0x7fffff00)   [main.c:107]

Any ideas what is going wrong?  It seems to die in the Initialize method while
trying to create a Label widget child.