D18076.id.diff
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D18076.id.diff
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	diff --git a/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php b/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
	--- a/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
	+++ b/src/markup/engine/remarkup/markuprule/PhutilRemarkupDocumentLinkRule.php
	@@ -120,9 +120,16 @@
	$protocols = $this->getEngine()->getConfig(
	'uri.allowed-protocols',
	array());
	- $protocol = id(new PhutilURI($uri))->getProtocol();
	- if (!idx($protocols, $protocol)) {
	- // Don't treat this as a URI if it's not an allowed protocol.
	+
	+ try {
	+ $protocol = id(new PhutilURI($uri))->getProtocol();
	+ if (!idx($protocols, $protocol)) {
	+ // Don't treat this as a URI if it's not an allowed protocol.
	+ $is_uri = false;
	+ }
	+ } catch (Exception $ex) {
	+ // We can end up here if we try to parse an ambiguous URI, see
	+ // T12796.
	$is_uri = false;
	}
	}