ssl-known-key.nse script error

[Christopher Clements <christopher.a.clements () gmail com>]

Got this script error during a scan today with svn version 29697
(sanitized):

NSE: sslcert.getCertificate error: Failed to connect to server
NSE: 'ssl-known-key' (thread: 0x3ba4610) against xx.xx.xx.xx:443 threw an
error!
/usr/local/bin/../share/nmap/scripts/ssl-known-key.nse:122: attempt to call
method 'digest' (a nil value)
stack traceback:
/usr/local/bin/../share/nmap/scripts/ssl-known-key.nse:122: in function
</usr/local/bin/../share/nmap/scripts/ssl-known-key.nse:107>
(...tail calls...)
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