diff --git a/.travis.yml b/.travis.yml
index fd4ee25c..1924f82a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,7 +41,7 @@ script:
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then ~/shfmt -l -w -i 2 . ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then git diff --exit-code && echo "shfmt OK" ; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck -V ; fi
-  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck -e SC2126,SC2034 **/*.sh && echo "shellcheck OK" ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then shellcheck -e SC2034 **/*.sh && echo "shellcheck OK" ; fi
   - cd ..
   - git clone https://github.com/Neilpang/acmetest.git && cp -r acme.sh acmetest/ && cd acmetest
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]] && [[ "$NGROK_TOKEN" ]]; then sudo NGROK_TOKEN="$NGROK_TOKEN" ./letest.sh ; fi
diff --git a/acme.sh b/acme.sh
index d0f97b1a..bd3a51b5 100755
--- a/acme.sh
+++ b/acme.sh
@@ -2356,6 +2356,12 @@ __get_domain_new_authz() {
       _err "Can not get domain new authz."
       return 1
     fi
+    if _contains "$response" "No registration exists matching provided key"; then
+      _err "It seems there is an error, but it's recovered now, please try again."
+      _err "If you see this message for a second time, please report bug: $(__green "$PROJECT")"
+      _clearcaconf "CA_KEY_HASH"
+      break
+    fi
     if ! _contains "$response" "An error occurred while processing your request"; then
       _info "The new-authz request is ok."
       break
diff --git a/dnsapi/dns_dp.sh b/dnsapi/dns_dp.sh
index 3691be06..301a1f6c 100755
--- a/dnsapi/dns_dp.sh
+++ b/dnsapi/dns_dp.sh
@@ -102,7 +102,7 @@ existing_records() {
   fi
 
   if _contains "$response" "Action completed successful"; then
-    count=$(printf "%s" "$response" | grep '<type>TXT</type>' | wc -l | tr -d ' ')
+    count=$(printf "%s" "$response" | grep -c '<type>TXT</type>' | tr -d ' ')
     record_id=$(printf "%s" "$response" | grep '^<id>' | tail -1 | cut -d '>' -f 2 | cut -d '<' -f 1)
     _debug record_id "$record_id"
     return 0