diff --git a/.github/workflows/scripts/check-docs.sh b/.github/workflows/scripts/check-docs.sh
index 28a8bce9..dff6b583 100755
--- a/.github/workflows/scripts/check-docs.sh
+++ b/.github/workflows/scripts/check-docs.sh
@@ -56,7 +56,7 @@ while [[ $# -gt 0 ]]; do
         collected+=("$1")
         shift
       done
-      docs_targets="${collected[*]}"
+      docs_targets="${collected[*]:-}"
       ;;
     --additional-docc-arguments)
       shift
@@ -65,7 +65,7 @@ while [[ $# -gt 0 ]]; do
         collected+=("$1")
         shift
       done
-      additional_docc_arguments="${collected[*]}"
+      additional_docc_arguments="${collected[*]:-}"
       ;;
     -h|--help)
       usage