JIRA XML backup fails with ArrayIndexOutOfBoundsException

When doing an XML backup, it may fail with this error if characters with values higher than 9000 have been entered into the database:

HTTP Status 500 - Error in action: com.atlassian.jira.action.admin.DataClean@13a1324, result: null:
65533<p><small><small><pre>java.lang.ArrayIndexOutOfBoundsException: 65533 at
com.atlassian.jira.util.StringUtils.escapeCP1252(StringUtils.java:125) at
com.atlassian.jira.action.admin.DataClean.escapeString(DataClean.java:94) at
com.atlassian.jira.action.admin.DataClean.escapeField(DataClean.java:102) at
com.atlassian.jira.action.admin.DataClean.doExecute(DataClean.java:39) at
webwork.action.ActionSupport.execute(ActionSupport.java:154) at
com.atlassian.jira.action.JiraActionSupport.execute(JiraActionSupport.java:46) at
com.atlassian.jira.action.JiraNonWebActionSupport.execute(JiraNonWebActionSupport.java:34) at
webwork.dispatcher.GenericDispatcher.executeAction(GenericDispatcher.java:131) at
com.atlassian.core.action.DefaultActionDispatcher.execute(DefaultActionDispatcher.java:34) at
com.atlassian.core.action.DefaultActionDispatcher.execute(DefaultActionDispatcher.java:22) at
com.atlassian.jira.web.action.util.ExportAll.doFixChars(ExportAll.java:108) at
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at