diff --git a/download.sh b/download.sh
index bf00655..97112a9 100755
--- a/download.sh
+++ b/download.sh
@@ -317,15 +317,13 @@ done
 (( DEBUG )) && { log "Debug mode enabled"; set -x; }
 
 # Enforce mutual exclusivity between -c, -p, -f
-set -- "$collection" "$post" "$file"
+# (avoid set -e pitfalls by not looping over empty args)
 count=0
-for x in "$@"; do
-  if [[ -n $x ]]; then
-    ((count++))
-  fi
-done
-# Ensure a zero exit status here to avoid set -e exiting if the last test was false
-true
+[[ -n $collection ]] && ((count++))
+[[ -n $post ]] && ((count++))
+[[ -n $file ]] && ((count++))
+
+log "Arg summary: collection='${collection:-}' post='${post:-}' file='${file:-}' (count=$count)"
 if (( count != 1 )); then
   usage
   die "Options -c, -p och -f kan inte användas samtidigt (exakt en krävs)."