Fix a bug that causes `renderXML` to crash (#66) #224

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Job	Run time
build (stack-lts-19)	41s
build (stack-lts-20)	41s
build (stack-lts-16.1)	39s
build (stack-lts-18)	40s
build (stack-lts-17.14)	35s
	3m 16s