diff --git a/.config/i3/blocks/iface b/.config/i3/blocks/iface
index 4d6ea2c..48e672e 100755
--- a/.config/i3/blocks/iface
+++ b/.config/i3/blocks/iface
@@ -32,7 +32,7 @@ fi
 
 #------------------------------------------------------------------------
 
-if [[ "$(cat /sys/class/net/$IF/operstate)" = 'down' ]]; then
+if [[ -z $IF ]] || [[ "$(cat /sys/class/net/$IF/operstate)" = 'down' ]]; then
     echo down # full text
     echo down # short text
     echo \#FF0000 # color