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	diff --git a/src/applications/fact/chart/PhabricatorHigherOrderChartFunction.php b/src/applications/fact/chart/PhabricatorHigherOrderChartFunction.php
	index 519e602a80..aef8f948be 100644
	--- a/src/applications/fact/chart/PhabricatorHigherOrderChartFunction.php
	+++ b/src/applications/fact/chart/PhabricatorHigherOrderChartFunction.php
	@@ -1,56 +1,60 @@
	<?php

	abstract class PhabricatorHigherOrderChartFunction
	extends PhabricatorChartFunction {

	public function getDomain() {
	$minv = array();
	$maxv = array();
	foreach ($this->getFunctionArguments() as $function) {
	$domain = $function->getDomain();
	if ($domain !== null) {
	list($min, $max) = $domain;
	- $minv[] = $min;
	- $maxv[] = $max;
	+ if ($min !== null) {
	+ $minv[] = $min;
	+ }
	+ if ($max !== null) {
	+ $maxv[] = $max;
	+ }
	}
	}

	if (!$minv && !$maxv) {
	return null;
	}

	$min = null;
	$max = null;

	if ($minv) {
	$min = min($minv);
	}

	if ($maxv) {
	$max = max($maxv);
	}

	return array($min, $max);
	}

	public function newInputValues(PhabricatorChartDataQuery $query) {
	$map = array();
	foreach ($this->getFunctionArguments() as $function) {
	$xv = $function->newInputValues($query);
	if ($xv !== null) {
	foreach ($xv as $x) {
	$map[$x] = true;
	}
	}
	}

	if (!$map) {
	return null;
	}

	ksort($map);

	return array_keys($map);
	}

	}