Array to string conversion in php-typography.php on line 1377

I think I found a solution. Search for this code in php-typography.php:

if(isset($this->settings["smartFractions"]) && $this->settings["smartFractions"]) {

Shortly afterwards the variable $pat is set. Replace

$pat = "/
				(?<=\A|\s|$nbsp|$nbnsp)																# lookbehind assertion: makes sure we are not messing up a url
				(\d+)
				(?:\s?\/\s?".$this->chr["zeroWidthSpace"].")										# strip out any zero-width spaces inserted by wrap_hard_hyphens
				(\d+)
				(
					(?:\<sup\>(?:st|nd|rd|th)<\/sup\>)?												# handle ordinals after fractions
					(?:\Z|\s|$this->chr['noBreakSpace']|$this->chr['noBreakNarrowSpace']|\.|\!|\?|\)|\;|\:|\'|\")			# makes sure we are not messing up a url
				)
			/xu";

with

$pat = "/
				(?<=\A|\s|$nbsp|$nbnsp)																# lookbehind assertion: makes sure we are not messing up a url
				(\d+)
				(?:\s?\/\s?".$this->chr["zeroWidthSpace"].")										# strip out any zero-width spaces inserted by wrap_hard_hyphens
				(\d+)
				(
					(?:\<sup\>(?:st|nd|rd|th)<\/sup\>)?												# handle ordinals after fractions
					(?:\Z|\s|".$this->chr["noBreakSpace"]."|".$this->chr["noBreakNarrowSpace"]."|\.|\!|\?|\)|\;|\:|\'|\")			# makes sure we are not messing up a url
				)
			/xu";

Regards
TiKu