diff --git a/debian/shadowsocks-libev.postinst b/debian/shadowsocks-libev.postinst
index f66eee0c..d6051d3d 100755
--- a/debian/shadowsocks-libev.postinst
+++ b/debian/shadowsocks-libev.postinst
@@ -26,12 +26,14 @@ case "$1" in
 			cap_net_bind_service+ep /usr/bin/ss-server \
 			cap_net_bind_service+ep /usr/bin/ss-tunnel
 		if [ ! -f /etc/shadowsocks-libev/config.json ]; then
+			set +e
 			pathfind apg
 			if [ $? -eq 0 ]; then
 				passwd=$(apg -n 1 -M ncl)
 			else
 				passwd=$(pwgen 12 1)
 			fi
+			set -e
 			mkdir -p /etc/shadowsocks-libev
 			sed "s/barfoo!/$passwd/" /usr/share/shadowsocks-libev/config.json \
 				> /etc/shadowsocks-libev/config.json