No more text in posts after update to 14.3

edited June 2016 in Theme support
Hello,

Today I updated BeTheme to 13.4 - After the update I get these errors on all post pages:

Warning: preg_match() expects parameter 2 to be string, array given in /homepages/14/d229118481/htdocs/dev.jugendfeuerwehr-stuttgart.de/wp-includes/formatting.php on line 1133



Warning: strip_tags() expects parameter 1 to be string, array given in /homepages/14/d229118481/htdocs/dev.jugendfeuerwehr-stuttgart.de/wp-includes/formatting.php on line 1571



Catchable fatal error: Object of class WP_Error could not be converted to string in /homepages/14/d229118481/htdocs/dev.jugendfeuerwehr-stuttgart.de/wp-content/themes/betheme/includes/header-single-intro.php on line 115

The text won't show anymore and you can only see the post image. Also there are no menues and header/footer on the post page. I changed the theme from BeTheme to TwentyFifteen and everything with the posts is alright.

Here's a link the website: www.jugendfeuerwehr-stuttgart.de

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