D25129.1738367750.diff
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	diff --git a/src/error/PhutilOpaqueEnvelope.php b/src/error/PhutilOpaqueEnvelope.php
	--- a/src/error/PhutilOpaqueEnvelope.php
	+++ b/src/error/PhutilOpaqueEnvelope.php
	@@ -60,11 +60,13 @@
	*/
	private function mask($string, $noise) {
	$result = '';
	- for ($ii = 0; $ii < strlen($string); $ii++) {
	- $s = $string[$ii];
	- $n = $noise[$ii % strlen($noise)];
	+ if (phutil_nonempty_string($string)) {
	+ for ($ii = 0; $ii < strlen($string); $ii++) {
	+ $s = $string[$ii];
	+ $n = $noise[$ii % strlen($noise)];

	- $result .= chr(ord($s) ^ ord($n));
	+ $result .= chr(ord($s) ^ ord($n));
	+ }
	}
	return $result;
	}