diff --git a/cmd/main.go b/cmd/main.go
index a1bee6a..cd1a1c2 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -49,7 +49,7 @@ func Serve(ctx *cli.Context) error {
 	acmeEabKID := ctx.String("acme-eab-kid")
 	acmeEabHmac := ctx.String("acme-eab-hmac")
 	dnsProvider := ctx.String("dns-provider")
-	if acmeAcceptTerms || (dnsProvider == "" && acmeAPI != "https://acme.mock.directory") {
+	if (!acmeAcceptTerms || dnsProvider == "") && acmeAPI != "https://acme.mock.directory" {
 		return errors.New("you must set $ACME_ACCEPT_TERMS and $DNS_PROVIDER, unless $ACME_API is set to https://acme.mock.directory")
 	}
 
@@ -109,7 +109,9 @@ func Serve(ctx *cli.Context) error {
 		return err
 	}
 
-	certificates.SetupCertificates(mainDomainSuffix, dnsProvider, acmeConfig, acmeUseRateLimits, enableHTTPServer, challengeCache, certDB)
+	if err := certificates.SetupCertificates(mainDomainSuffix, dnsProvider, acmeConfig, acmeUseRateLimits, enableHTTPServer, challengeCache, certDB); err != nil {
+		return err
+	}
 
 	interval := 12 * time.Hour
 	certMaintainCtx, cancelCertMaintain := context.WithCancel(context.Background())
diff --git a/html/error.go b/html/error.go
index f831443..325dada 100644
--- a/html/error.go
+++ b/html/error.go
@@ -2,8 +2,9 @@ package html
 
 import (
 	"bytes"
-	"github.com/valyala/fasthttp"
 	"strconv"
+
+	"github.com/valyala/fasthttp"
 )
 
 // ReturnErrorPage sets the response status code and writes NotFoundPage to the response body, with "%status" replaced