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java.lang.NullPointerException: 	at java.util.regex.Matcher.getTextLength(Matcher.java:1140)	at java.util.regex.Matcher.reset(Matcher.java:291)	at java.util.regex.Matcher.(Matcher.java:211)	at java.util.regex.Pattern.matcher(Pattern.java:888)	at com.atlassian.diff.WordLevelDiffer.tokenize(WordLevelDiffer.java:153)	at com.atlassian.diff.WordLevelDiffer.diffLine(WordLevelDiffer.java:72)	at com.atlassian.diff.DiffViewBean.createWordLevelDiff(DiffViewBean.java:123)	at com.atlassian.jira.mail.DiffUtils.diff(DiffUtils.java:23)	at sun.reflect.GeneratedMethodAccessor5065.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.doInvoke(UberspectImpl.java:381)	at org.apache.velocity.util.introspection.UberspectImpl$VelMethodImpl.invoke(UberspectImpl.java:370)	at com.atlassian.velocity.htmlsafe.introspection.UnboxingMethod.invoke(UnboxingMethod.java:30)