Internal Server Error - Survey Link

HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
	java.util.regex.Pattern.<init>(Unknown Source)
	java.util.regex.Pattern.compile(Unknown Source)
	java.util.regex.Pattern.matches(Unknown Source)
	java.lang.String.matches(Unknown Source)
	com.adventnet.servicedesk.filter.EncodingFilter.doFilter(EncodingFilter.java:202)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.26 logs.

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Is produced when someone clicks on a Survey Link.

We are at latest Version ( SDP 9233) and have NTLMv2 Passthrough Authentication enabled on the site.

Any ideas?