export throws null pointer exception when servlet context contains capital letter

javax.servlet.ServletException
	at com.atlassian.plugin.servlet.BaseFileServerServlet.doGet(BaseFileServerServlet.java:87)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at com.atlassian.confluence.util.LoggingContextFilter.doFilter(LoggingContextFilter.java:49)
...
caused by:
java.lang.NullPointerException
	at com.atlassian.confluence.servlet.download.ExportDownload.getStreamForDownload(ExportDownload.java:61)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload$StreamResultCallback.doInTransaction(ServeAfterTransactionDownload.java:128)
	at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload.getStreamInTransaction(ServeAfterTransactionDownload.java:40)
	at com.atlassian.confluence.servlet.download.ServeAfterTransactionDownload.serveFile(ServeAfterTransactionDownload.java:46)
	at com.atlassian.plugin.servlet.BaseFileServerServlet.doGet(BaseFileServerServlet.java:77)
...