Danger fails on some error from html5validator

[php-coder]

Failure error:

[!] Invalid Dangerfile file: undefined method [] for nil:NilClass

 #  from Dangerfile:396
 #  -------------------------------------------
 #  		parsed = line.match(/^"file:(?<file>[^"]+)":(?<line>\d+)[^:]+: (error|info warning): (?<msg>.+)/)
 >  		msg    = parsed['msg'].sub(/\.$/, '')
 #  		file   = parsed['file'].sub(pwd, '')
 #  -------------------------------------------

html5validator output:

=====> Run html5validator

ERROR:html5validator.validator:"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":11.2-11.43: error: Element "head" is missing a required instance of child element "title".
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":11.2-11.43: info warning: Element name "th:block" cannot be represented as XML 1.0.
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":11.2-11.43: error: Element "th:block" not allowed as child of element "body" in this context. (Suppressing further errors from this subtree.)
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":16.2-16.102: error: A "link" element must not appear as a descendant of a "body" element unless the "link" element has an "itemprop" attribute or has a "rel" attribute whose value contains "dns-prefetch", "pingback", "preconnect", "prefetch", "preload", "prerender", or "stylesheet".
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":19.1-19.7: error: Stray end tag "head".
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":20.1-20.6: error: Start tag "body" seen but an element of the same type was already open.
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":63.4-63.45: info warning: Element name "th:block" cannot be represented as XML 1.0.
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":63.4-63.45: error: Element "th:block" not allowed as child of element "div" in this context. (Suppressing further errors from this subtree.)
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":67.5-67.87: error: Duplicate ID "error-msg".
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":64.5-64.70: info warning: The first occurrence of ID "error-msg" was here.
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":70.5-70.87: error: Duplicate ID "error-msg".
"file:/home/travis/build/php-coder/mystamps/src/main/webapp/WEB-INF/views/error/status-code.html":64.5-64.70: info warning: The first occurrence of ID "error-msg" was here.

[php-coder]

I was able to reproduce it locally and found the cause. It fails on

ERROR:html5validator.validator:"file:/Users/coder/git/mystamps/src/main/webapp/WEB-INF/views/site/events.html":194.4-194.30: error: Duplicate ID "logo".

because the line is started from ERROR:html5validator.validator: while we expect it to start with WARNING:html5validator.validator: