Argument 1 passed to RegexHelper::isEscapable() must be of the type string, null given

[ntzm]

Version(s) affected: 1.2.1

Description

When converting malformed markdown, I get a TypeError

How to reproduce

Markdown:

[](\B\

PHP Fatal error:  Uncaught TypeError: Argument 1 passed to League\CommonMark\Util\RegexHelper::isEscapable() must be of the type string, null given, called in /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Util/LinkParserHelper.php on line 101 and defined in /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Util/RegexHelper.php:74
Stack trace:
#0 /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Util/LinkParserHelper.php(101): League\CommonMark\Util\RegexHelper::isEscapable(NULL)
#1 /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Util/LinkParserHelper.php(41): League\CommonMark\Util\LinkParserHelper::manuallyParseLinkDestination(Object(League\CommonMark\Cursor))
#2 /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Inline/Parser/CloseBracketParser.php(154): League\CommonMark\Util\LinkParserHelper::parseLinkDestination(Object(League\CommonMark\Cursor))
#3 /home/nat/Code/personal/fuzzer-test/commo in /home/nat/Code/personal/fuzzer-test/commonmark/vendor/league/commonmark/src/Util/RegexHelper.php on line 74

[GrahamCampbell]

#404 should fix your issue. ;)

[colinodell]

Fixed via db580f6 (thanks Graham!) and included in new releases 1.1.3 and 1.2.2.