diff --git a/scripts/check-image.sh b/scripts/check-image.sh
index 33c1b53..a002e1a 100755
--- a/scripts/check-image.sh
+++ b/scripts/check-image.sh
@@ -39,6 +39,7 @@ for line in $(cat not_sync.yaml | yq -j '.not_sync[] | .image_pattern , "=", (.t
 done
 
 LOGFILE="./check-image.log"
+echo >"${LOGFILE}"
 
 for line in $(cat ./mirror.txt); do
     line="${line/ /}"
@@ -57,13 +58,13 @@ for line in $(cat ./mirror.txt); do
     domain="${line%%/*}"
     new_image=$(echo "${line}" | sed "s/^${domain}/${DOMAIN_MAP["${domain}"]}/g")
     echo "Diff image ${line} ${new_image}"
-    DEBUG=true INCREMENTAL=true EXCLUDED="${exclude}" ./scripts/diff-image.sh "${line}" "${new_image}" | tee -a "${LOGFILE}" || {
+    DEBUG=true INCREMENTAL=true EXCLUDED="${exclude}" ./scripts/diff-image.sh "${line}" "${new_image}" 2>&1 | tee -a "${LOGFILE}" || {
         echo "Error: diff image ${line} ${new_image}"
     }
 done
 
-sync=$(cat "${LOGFILE}" | grep " SYNC: " | wc -l | tr -d ' ')
-nosync=$(cat "${LOGFILE}" | grep " NOSYNC: " | wc -l | tr -d ' ')
+sync="$(cat "${LOGFILE}" | grep " SYNC: " | wc -l | tr -d ' ' || :)"
+nosync="$(cat "${LOGFILE}" | grep " NOSYNC: " | wc -l | tr -d ' ' || :)"
 sum=$(($sync + $nosync))
 
 echo https://img.shields.io/badge/Sync-${sync}%2F${sum}-blue
diff --git a/scripts/diff-image.sh b/scripts/diff-image.sh
index 3aec503..ab85852 100755
--- a/scripts/diff-image.sh
+++ b/scripts/diff-image.sh
@@ -100,7 +100,7 @@ function list-tags() {
     local raw="$(skopeo list-tags --tls-verify=false "docker://${image}" | jq -r '.Tags[]' | sort)"
 
     if [[ "${EXCLUDED}" != "" ]]; then
-        raw="$(echo "${raw}" | grep -v -E "${EXCLUDED}")"
+        raw="$(echo "${raw}" | grep -v -E "${EXCLUDED}" || :)"
     fi
     echo "${raw}"
 }
@@ -134,11 +134,11 @@ function diff-image() {
 
     local tags1="$(list-tags ${image1})"
     local tags2="$(list-tags ${image2})"
-    local diff_raw="$(diff --unified <(echo "${tags1}") <(echo "${tags2}") | grep -v -E '^---' | grep -v -E '^\+\+\+')"
-    local diff_data="$(echo "${diff_raw}" | grep -v -E '^ ')"
+    local diff_raw="$(diff --unified <(echo "${tags1}") <(echo "${tags2}") | grep -v -E '^---' | grep -v -E '^\+\+\+' || :)"
+    local diff_data="$(echo "${diff_raw}" | grep -v -E '^ ' || :)"
 
     if [[ "${INCREMENTAL}" == "true" ]]; then
-        diff_data="$(echo "${diff_data}" | grep -v -E '^\+')"
+        diff_data="$(echo "${diff_data}" | grep -v -E '^\+' || :)"
     fi
 
     if [[ "${diff_data}" != "" ]]; then
@@ -151,15 +151,15 @@ function diff-image() {
             echo "DEBUG: diff:" >&2
             echo "${diff_data}" >&2
         fi
-        for tag in $(echo "$(echo "${diff_raw}" | grep -E '^-')"); do
+        for tag in $(echo "${diff_raw}" | grep -E '^-' || :); do
             tag="${tag#-}"
             echo "${SELF}: UNSYNC: ${image1}:${tag} and ${image2}:${tag} are not in synchronized, ${image2}:${tag} is empty" >&2
         done
-        for tag in $(echo "$(echo "${diff_raw}" | grep -E '^\+')"); do
+        for tag in $(echo "${diff_raw}" | grep -E '^\+' || :); do
             tag="${tag#+}"
             echo "${SELF}: UNSYNC: ${image1}:${tag} and ${image2}:${tag} are not in synchronized, ${image1}:${tag} is empty" >&2
         done
-        echo "$(echo "${diff_raw}" | grep -E '^ ' | tr -d ' ')"
+        echo "$(echo "${diff_raw}" | grep -E '^ ' | tr -d ' ' || :)"
         return 1
     fi
     echo "${SELF}: SYNC-TAGS: ${image1} and ${image2} are in synchronized" >&2