I have found the following bug in frx2word utility:

if report variable initial value uses a previous report variable initial value,
an error occurs in .initvars() method.

I fixed it by adding two lines to initvars method.

		this.vardata[m.i,4]		= rpt.totaltype
		this.vardata[m.i,5]		= 0
		this.vardata[m.i,6]		= 0

* The next line produses error if initial value use other var initial value
		this.vardata[m.i,7]		= eval(allt(rpt.tag))

		this.vardata[m.i,8]		= vartype(eval(allt(rpt.tag)))
		this.vardata[m.i,9]		= this.vardata[m.i,7]

* Those linses are added to fix this error
PRIVATE (ALLTRIM(rpt.name))
STORE eval(allt(rpt.tag)) TO (alltrim(rpt.name))