diff --git a/back/lib/admin/peer/list b/back/lib/admin/peer/list
index e4ebe90..32e27db 100755
--- a/back/lib/admin/peer/list
+++ b/back/lib/admin/peer/list
@@ -62,7 +62,7 @@ fi
 
 # Get domains for each peer
 if peers="[$("${LIB_DIR}/ips_to_peers" json <<<"${peers}")]"; then
-	printf '{"token":"%s","peers":%s}' "${token!}" "${peers!}" | "${LIB_DIR}/http_res" 200 'application/json'
+	printf '{"token":"%s","peers":%s}' "${token:?}" "${peers:?}" | "${LIB_DIR}/http_res" 200 'application/json'
 	printf 'Sent peers to admin %s\n' "${ip}" >>"${LOGFILE}"
 else
 	printf 'ERROR: Failed to lookup user: %s\n' "${ip}" >>"${LOGFILE}"