diff --git a/cr.sh b/cr.sh
index 8126548..a8cb24b 100755
--- a/cr.sh
+++ b/cr.sh
@@ -285,15 +285,21 @@ filter_charts() {
 lookup_changed_charts() {
   local commit="$1"
 
-  local changed_files
-  changed_files=$(git diff --find-renames --name-only "$commit" -- "$charts_dir")
+  if [ -z "$commit" ]; then
+    # If no commit is given (i.e., no previous tag), consider all charts.
+    find "$charts_dir" -maxdepth 1 -type d | filter_charts
+  else
+    local changed_files
+    changed_files=$(git diff --find-renames --name-only "$commit" -- "$charts_dir")
 
-  local depth=$(($(tr "/" "\n" <<<"$charts_dir" | sed '/^\(\.\)*$/d' | wc -l) + 1))
-  local fields="1-${depth}"
+    local depth=$(($(tr "/" "\n" <<<"$charts_dir" | sed '/^\(\.\)*$/d' | wc -l) + 1))
+    local fields="1-${depth}"
 
-  cut -d '/' -f "$fields" <<<"$changed_files" | uniq | filter_charts
+    cut -d '/' -f "$fields" <<<"$changed_files" | uniq | filter_charts
+  fi
 }
 
+
 package_chart() {
   local chart="$1"