Warning in customizr separate "Posts Page"

I recently separated the Posts Page onto a special page, and made the home page a static one. Also, I used this to be able to show posts on a static page in the manner that the template does by default. I reckon this solution is pretty old so I think it runs into some syntax problems, but I couldn’t find any.

This is the warning:

Warning: implode(): Invalid arguments passed in D:\WAMP_server\www\site_ascig\wp-content\themes\customizr.3.4.21\customizr\inc\parts\class-content-headings.php on line 115 Call Stack #TimeMemoryFunctionLocation 10.0129243224{main}( )..\index.php:0 20.0141246376require( 'D:\WAMP_server\www\site_ascig\wp-blog-header.php' )..\index.php:17 30.597225582376require_once( 'D:\WAMP_server\www\site_ascig\wp-includes\template-loader.php' )..\wp-blog-header.php:19 40.638426056304include( 'D:\WAMP_server\www\site_ascig\wp-content\themes\customizr.3.4.21\customizr\home.php' )..\template-loader.php:75 50.638826063360get_template_part( )..\home.php:72 60.638926064056locate_template( )..\general-template.php:167 70.639326064280load_template( )..\template.php:531 80.640426095328require( 'D:\WAMP_server\www\site_ascig\wp-content\themes\customizr.3.4.21\customizr\index.php' )..\template.php:574 91.216726520216do_action( )..\index.php:22 101.225626548832call_user_func_array:{D:\WAMP_server\www\site_ascig\wp-includes\plugin.php:525} ( )..\plugin.php:525 111.225626548976TC_headings->tc_render_headings_view( )..\plugin.php:525 121.225726566008implode ( )..\class-content-headings.php:115 ">

I’d be grateful if you could assist me in finding the syntax problem.

Thanks alot!