D25868.1740120751.diff
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D25868.1740120751.diff
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	diff --git a/src/view/page/PhabricatorStandardPageView.php b/src/view/page/PhabricatorStandardPageView.php
	--- a/src/view/page/PhabricatorStandardPageView.php
	+++ b/src/view/page/PhabricatorStandardPageView.php
	@@ -626,20 +626,25 @@
	// Try to guess the device resolution based on UA strings to avoid a flash
	// of incorrectly-styled content.
	$device_guess = 'device-desktop';
	- if (preg_match('@iPhone\|iPod\|(Android.Chrome/[.0-9] Mobile)@', $agent)) {
	- $device_guess = 'device-phone device';
	- } else if (preg_match('@iPad\|(Android.*Chrome/)@', $agent)) {
	- $device_guess = 'device-tablet device';
	+ if (phutil_nonempty_string($agent)) {
	+ if (preg_match('@iPhone\|iPod\|(Android.Chrome/[.0-9] Mobile)@',
	+ $agent)) {
	+ $device_guess = 'device-phone device';
	+ } else if (preg_match('@iPad\|(Android.*Chrome/)@', $agent)) {
	+ $device_guess = 'device-tablet device';
	+ }
	}

	$classes[] = $device_guess;

	- if (preg_match('@Windows@', $agent)) {
	- $classes[] = 'platform-windows';
	- } else if (preg_match('@Macintosh@', $agent)) {
	- $classes[] = 'platform-mac';
	- } else if (preg_match('@X11@', $agent)) {
	- $classes[] = 'platform-linux';
	+ if (phutil_nonempty_string($agent)) {
	+ if (preg_match('@Windows@', $agent)) {
	+ $classes[] = 'platform-windows';
	+ } else if (preg_match('@Macintosh@', $agent)) {
	+ $classes[] = 'platform-mac';
	+ } else if (preg_match('@X11@', $agent)) {
	+ $classes[] = 'platform-linux';
	+ }
	}

	if ($this->getRequest()->getStr('__print__')) {