PHP Fatal error

Hi
I have a fatal error when I try to test it with Twenty Fifteen and no other plugins activated:

[29-Sep-2015 08:11:30 UTC] PHP Fatal error:  Exception in Nette\Templating\Template::__toString(): preg_match(): Compilation failed: internal error: previously-checked referenced subpattern not found at offset 462 in pattern: ~
			(?:(?<=\n|^)[ \t]*)?<(?P<closing>/?)(?P<tag>[a-z0-9:]+)|  ##  begin of HTML tag <tag </tag - ignores <!DOCTYPE
			<(?P<htmlcomment>!--)|     ##  begin of HTML comment <!--

			(?P<comment>\{(?![\s'"{}])\*.*?\*\}\n{0,2})|
			\{(?![\s'"{}])
				(?P<macro>(?:'(?:\\.|[^'\\])*'|"(?:\\.|[^"\\])*"|\{
						(?P<inner>'(?:\\.|[^'\\])*'|"(?:\\.|[^"\\])*"|\{(?P>inner)\}|[^'"{}])*+
				\}|[^'"{}])+?)
			\}
			(?P<rmargin>[ \t]*(?=\n))?
		         ##  macro tag
		~xsi in /home/webdev/lampp/htdocs/wordpress/wp-content/plugins/simple-subscribe/libs/Nette/Nette.min.php:7237 in /home/webdev/lampp/htdocs/wordpress/wp-content/plugins/simple-subscribe/libs/Nette/Nette.min.php on line 6683

https://www.ads-software.com/plugins/simple-subscribe/