fatal error while compiling

[jsbach]

i'm getting error:
"fatal error while compiling myscript.nsi". dialog title
is 4112.
first troubleshooting seems to show it's related to lzma compressor: if i use instead set compressor /solid zlib
i don't get the error.
strange to say, issue arise first time today on a script just a little bit modified.
nothing found in other posts.