diff --git a/functions.sh b/functions.sh
index 45812a8dab75..6015704d58dd 100644
--- a/functions.sh
+++ b/functions.sh
@@ -60,7 +60,7 @@ sonic_get_version() {
     BUILD_NUMBER=${BUILD_NUMBER:-0}
     ## Check if we are on tagged commit
     ## Note: escape the version string by sed: / -> _
-    if [ "$describe" == "$latest_tag" ]; then
+    if [ -n "$latest_tag" ] && [ "$describe" == "$latest_tag" ]; then
         echo "${latest_tag}${dirty}" | sed 's/\//_/g'
     else
         echo "${branch_name}.${BUILD_NUMBER}${dirty:--$(git rev-parse --short HEAD)}" | sed 's/\//_/g'