Error handle

[abolinhas]

Hi
How can i catch any error of dns resolve withou crashing the APP?
I mean, this is my code:

resolvers := []string{
				dns1,
				dns2,
			}
			url := strings.TrimSuffix(w, "\n")
			domains := []string{
				url + ".filter.site.com",
			}

			client := resolvermt.New(resolvers, 3, 1000, 5)
			defer client.Close()
			results := client.Resolve(domains, resolvermt.TypeTXT)
			for _, record := range results {

				s := strings.Split(record.Answer, ":")
				cat_name := strings.Replace(s[01], " ", "_", -1)
				cat_name = strings.Replace(cat_name, "/", "_", -1)

				_catID, _ = strconv.Atoi(s[0])
				_catName = cat_name
				internal.InMemoryCache.Append(w, []byte(strconv.Itoa(_catID)+":"+_catName))
				elapsed := time.Since(start).Microseconds()
				if isDebug {
					log.Printf("%s founded in DNS Cloud Servers with category %s (%d) - took %d μs", w, _catName, _catID, elapsed)
				}
			}

When I try resolve a valid address it's works perfectly:

root@proxy01:~# curl http://localhost:3333/get-categories?website=sapo.pt
{"category_id":"3","category_name":"Society"}

But if I try an invalid url, the app craches:

root@proxy01:~# curl http://localhost:3333/get-categories?website=sapo.pt^^^
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x6b792d]

goroutine 1999 [running]:
github.com/d3mondev/resolvermt.(*resolverDNS).Resolve(0xc01754ea80, {0xc016fff8c0, 0x1d}, 0x0?)
        C:/Users/andre/go/pkg/mod/github.com/d3mondev/[email protected]/resolverdns.go:46 +0x6d
github.com/d3mondev/resolvermt.(*clientDNS).startThreads.func1(0xc014deea40?)
        C:/Users/andre/go/pkg/mod/github.com/d3mondev/[email protected]/client_dns.go:50 +0x3f
created by github.com/d3mondev/resolvermt.(*clientDNS).startThreads
        C:/Users/andre/go/pkg/mod/github.com/d3mondev/[email protected]/client_dns.go:42 +0x59
root@proxy01:/usr/share/artica-postfix/bin/go-shield/server/bin# ./go-shield-server

[abolinhas]

any update or the project is dead?