Call to undefined function fastcgi_finish_request

This plugin is causing the following error to appear:

Error Info
Error: Call to undefined function fastcgi_finish_request() –

Full details:

Stack Trace
#0 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/router/package.module.router.php(613): C_NextGEN_Bootstrap::shutdown()
#1 [internal function]: Mixin_Routing_App->execute_route_handler(Array)
#2 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(659): ReflectionMethod->invokeArgs(Object(Mixin_Routing_App), Array)
#3 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(498): ExtensibleObject->_exec_cached_method('execute_route_h...', Array)
#4 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(581): ExtensibleObject->__call('execute_route_h...', Array)
#5 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(799): ExtensibleObject->call_method('execute_route_h...', Array)
#6 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/i18n/package.module.i18n.php(15): Mixin->call_parent('execute_route_h...', Array)
#7 [internal function]: A_I18N_Routing_App->execute_route_handler(Array)
#8 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(659): ReflectionMethod->invokeArgs(Object(A_I18N_Routing_App), Array)
#9 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(498): ExtensibleObject->_exec_cached_method('execute_route_h...', Array)
#10 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/router/package.module.router.php(587): ExtensibleObject->__call('execute_route_h...', Array)
#11 [internal function]: Mixin_Routing_App->serve_request('/')
#12 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(659): ReflectionMethod->invokeArgs(Object(Mixin_Routing_App), Array)
#13 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(498): ExtensibleObject->_exec_cached_method('serve_request', Array)
#14 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/router/package.module.router.php(193): ExtensibleObject->__call('serve_request', Array)
#15 [internal function]: Mixin_Router->serve_request()
#16 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(659): ReflectionMethod->invokeArgs(Object(Mixin_Router), Array)
#17 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/vendor/imagely/pope-framework/lib/class.extensibleobject.php(498): ExtensibleObject->_exec_cached_method('serve_request', Array)
#18 /home/<domain>/public_html/wp-content/plugins/nextgen-gallery/nggallery.php(603): ExtensibleObject->__call('serve_request', Array)
#19 /home/<domain>/public_html/wp-includes/class-wp-hook.php(303): C_NextGEN_Bootstrap->route('')
#20 /home/<domain>/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array)
#21 /home/<domain>/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array)
#22 /home/<domain>/public_html/wp-settings.php(578): do_action('init')
#23 /home/<domain>/public_html/wp-config.php(94): require_once('/home/openartsf...')
#24 /home/<domain>/public_html/wp-load.php(50): require_once('/home/openartsf...')
#25 /home/<domain>/public_html/wp-blog-header.php(13): require_once('/home/openartsf...')
#26 /home/<domain>/public_html/index.php(17): require('/home/openartsf...')
#27 {main}
Request State
array(3) {
["url"] => string(82) "https://<domain>.com/nextgen-image/580/0x560/0451f556201d0a6fb5803ed0e5e8187d"
["_GET"] => array(0) {
}
["_POST"] => array(0) {
}
}

How can I fix this? Or can you fix it?