RichText converter in HTML format throw error exception for some string patterns

[marc-farre]

What steps will reproduce the problem?

Add this code (the string pattern must have \ at the end of a line and > at the beginning of the next line):

use humhub\modules\content\widgets\richtext\RichText;
RichText::convert('some text \
> some text', RichText::FORMAT_HTML)

Log error

yii\base\ErrorException: Uninitialized string offset: 1 in /var/www/hhdev/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php:341 
Stack trace: #0 
/var/www/hhdev/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php(341): yii\base\ErrorHandler->handleError(8, 'Uninitialized s...', '/var/www/hhdev/...', 341, Array) #1 
/var/www/hhdev/protected/vendor/cebe/markdown/Parser.php(346): humhub\modules\content\widgets\richtext\converter\BaseRichTextConverter->parseEscape('\\') #2 
/var/www/hhdev/protected/vendor/cebe/markdown/GithubMarkdown.php(95): cebe\markdown\Parser->parseInline('\\') #3 
/var/www/hhdev/protected/vendor/cebe/markdown/Parser.php(195): cebe\markdown\GithubMarkdown->consumeParagraph(Array, 0) #4
/var/www/hhdev/protected/vendor/cebe/markdown/Parser.php(170): cebe\markdown\Parser->parseBlock(Array, 0) #5
/var/www/hhdev/protected/vendor/cebe/markdown/Parser.php(60): cebe\markdown\Parser->parseBlocks(Array) #6 
/var/www/hhdev/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php(233): cebe\markdown\Parser->parse('some text \\\n> s...') #7 
/var/www/hhdev/protected/humhub/modules/content/widgets/richtext/converter/BaseRichTextConverter.php(157): humhub\modules\content\widgets\richtext\converter\BaseRichTextConverter->parse('some text \\\n> s...') #8 
/var/www/hhdev/protected/humhub/modules/content/widgets/richtext/ProsemirrorRichTextConverter.php(26): humhub\modules\content\widgets\richtext\converter\BaseRichTextConverter::process('some text \\\n> s...', Array) #9 
/var/www/hhdev/protected/humhub/modules/content/widgets/richtext/AbstractRichText.php(352): humhub\modules\content\widgets\richtext\ProsemirrorRichTextConverter->convertToHtml('some text \\\n> s...', Array) #10
...

Additional info

Q	A
HumHub version	1.8.1

[yurabakhtin]

@luke- Fixed in PR #5044.

[luke-]

@yurabakhtin Thanks!