diff --git a/bin/xss-lock b/bin/xss-lock
index 8046725..0d2de9d 100755
--- a/bin/xss-lock
+++ b/bin/xss-lock
@@ -22,8 +22,8 @@ case "$1" in
         echo "notify: start"
         pkill -STOP redshift
         trap 'pkill -CONT redshift' EXIT
-        trap 'kill %%; exit 0' HUP
-        trap 'sleep 1s; kill %%; exit 0' TERM
+        trap 'kill %% 2> /dev/null; exit 0' HUP
+        trap 'sleep 1s; kill %% 2> /dev/null; exit 0' TERM
         outputs=($(xrandr -q | sed -n 's/\([^ ]*\) connected .*/\1/p'))
         for i in $(seq 0.7 -0.01 0.1); do
             for out in ${outputs[@]}; do