return session_ptr[0] in sslhandshake

Author: chronolaw

lib/resty/core/socket.lua

@@ -248,7 +248,7 @@ local function sslhandshake(cosocket, reused_session, server_name, ssl_verify,
         end
 
         if session_ptr[0] == nil then
-            return nil
+            return session_ptr[0]
         end
 
         return ffi_gc(session_ptr[0], C.ngx_http_lua_ffi_ssl_free_session)