Media gallery not loadin insert media to post

Additionally the error log shows Premature end of script errors:

[Sun Oct 02 00:31:22 2016] [error] [client 104.168.156.64] Premature end of script headers: index.php, referer: https://www.shopsos.com/carmen-busquets-fashion-e-commerces-fairy-godmother/
[Sun Oct 02 00:31:32 2016] [error] [client 104.168.156.64] Premature end of script headers: index.php, referer: https://www.shopsos.com/carmen-busquets-fashion-e-commerces-fairy-godmother/
[Sun Oct 02 00:35:18 2016] [error] [client 96.47.231.82] Premature end of script headers: index.php, referer: https://www.shopsos.com/15-iconic-moments-in-underwear-history/
[Sun Oct 02 00:35:28 2016] [error] [client 96.47.231.82] Premature end of script headers: index.php, referer: https://www.shopsos.com/15-iconic-moments-in-underwear-history/
[Sun Oct 02 00:35:30 2016] [error] [client 96.47.231.82] Premature end of script headers: index.php, referer: https://www.shopsos.com/15-iconic-moments-in-underwear-history/
[Sun Oct 02 00:42:55 2016] [error] [client 74.125.76.34] Premature end of script headers: index.php
[Sun Oct 02 00:43:00 2016] [error] [client 131.161.9.209] Premature end of script headers: index.php
[Sun Oct 02 00:47:27 2016] [error] [client 192.99.186.105] Premature end of script headers: index.php, referer: https://www.shopsos.com/the-tuck-room-will-serve-a-little-history-with-your-highball/
[Sun Oct 02 00:47:28 2016] [error] [client 192.99.186.105] Premature end of script headers: index.php, referer: https://www.shopsos.com/the-tuck-room-will-serve-a-little-history-with-your-highball/