Crash bug and proposed patch

I recently ran into a crash bug with elinks. I've provided a backtrace,
a sample document, and a proposed patch. Basically, html_special() in
src/document/html/renderer.c sets document->refresh without checking
to see if document is a valid pointer first (inside the SP_REFRESH
case).

http://joeysmith.com/elinks-patch.tar.bz2 contains:
1) nullptr.patch - proposed patch
2) bt.txt - GDB backtrace from my debian (sid) system
3) crash.html - The file that exposed the bug

I'm providing it this way because linuxfromscratch.org's spamassassin
won't let me attach the files directly.

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