I am seeing a lot of these entries in my logs

Nov 6 04:29:13 sv1 kernel: nginx[62598]: segfault at 0 ip 0000000000438f38 sp 0 0007fffa5a934c0 error 4 in nginx (deleted)[400000+e2000]
Nov 6 04:29:13 sv1 abrt[22289]: File '/usr/sbin/nginx' seems to be deleted
Nov 6 04:29:13 sv1 abrt[22289]: Not saving repeating crash in '/usr/sbin/nginx'
Nov 6 04:29:17 sv1 abrtd: Package 'nginx' isn't signed with proper key
Nov 6 04:29:17 sv1 abrtd: 'post-create' on '/var/spool/abrt/ccpp-2014-11-06-04: 29:08-56907' exited with 1
Nov 6 04:29:17 sv1 abrtd: Deleting problem directory '/var/spool/abrt/ccpp-2014 -11-06-04:29:08-56907'

How can i fix this

nginx version: nginx/1.7.7
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC)
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/var/run/nginx.pid --lock-path=/var/lock/subsys/nginx --user=nginx --group=nginx --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_spdy_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module --with-http_image_filter_module --with-http_geoip_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_stub_status_module --with-http_perl_module --with-mail --with-mail_ssl_module --with-debug --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --with-ld-opt=-Wl,-E