set -u earlier in the script

config/chroot_local-includes/usr/local/sbin/tails-i2p

 #!/bin/sh
 
 set -e
+set -u
+ZSH_VERSION="${ZSH_VERSION:-}"
 
 # Get LANG
 . /etc/default/locale
@@ -11,9 +13,6 @@ export LANG
 TEXTDOMAIN="tails"
 export TEXTDOMAIN
 
-# Must be set after gettext initialization
-set -u
-
 # Import wait_until()
 . /usr/local/lib/tails-shell-library/common.sh
 # Import i2p_has_bootstrapped, i2p_reseed_failed, i2p_router_console_is_ready(),