A NetScaler appliance might crash when an HTTP/2 enabled virtual server generates a response for an HTTP/2 request, instead of forwarding the request to the back-end service.

Solution : Fix is available in following versions : 

13.1-45.64 and later builds 
13.0-90.12 and later builds 

Workaround: If unable to upgrade to fixed builds . Disable HTTP2 in the HTTP profile bound to the virtual server.

Via GUI : 



Via CLI :

set ns httpProfile <Profile-Name> -http2 DISABLED

NOTE :  Make sure to disable HTTP/2 in all the HTTP profile configured .