diff --git a/gaboshlib/g_signal-notify.bashfunc b/gaboshlib/g_signal-notify.bashfunc
index 8776af3..9349bfb 100644
--- a/gaboshlib/g_signal-notify.bashfunc
+++ b/gaboshlib/g_signal-notify.bashfunc
@@ -2,6 +2,8 @@
 
 function g_signal-notify {
   [ -z "$1" ] && return 0
+  [ -s /usr/local/bin/notify.sh ] || g_echo_error "$0: /usr/local/bin/notify.sh empty or not existing"
+  [ -x /usr/local/bin/notify.sh ] || g_echo_error "$0: /usr/local/bin/notify.sh not executable"
   [ -n "${SIGNAL_GROUP}" ] && g_signal_group="-g \"${SIGNAL_GROUP}\""
-  cat <<< "$(g_date_print) $@" | tail -n 100 | /usr/local/bin/notify.sh $g_signal_group 
+  cat <<< "$(g_date_print) $@" | tail -n 100 | /usr/local/bin/notify.sh $g_signal_group
 }