diff --git a/configure b/configure
index d983516a..e7fb46ce 100755
--- a/configure
+++ b/configure
@@ -3,7 +3,7 @@
 # Copyright (C) 2021 Alexandre Pujol <alexandre@pujol.io>
 # SPDX-License-Identifier: GPL-2.0-only
 
-set -e
+set -eu
 
 DISTRIBUTION="$(lsb_release --id --short)"
 readonly DISTRIBUTION="${DISTRIBUTION,,}"
@@ -97,7 +97,7 @@ flags() {
 
 		while read -r profile; do
 			IFS=' ' read -r -a manifest <<< "$profile"
-			profile="${manifest[0]}" flags="${manifest[1]}"
+			profile="${manifest[0]:-}" flags="${manifest[1]:-}"
 
 			[[ "$profile" =~ ^\# || -z "$profile" ]] && continue
 			path="${ROOT:?}/apparmor.d/$profile"