diff --git a/notify.sh b/notify.sh
index 9e4e2a1..030dc88 100755
--- a/notify.sh
+++ b/notify.sh
@@ -1,5 +1,10 @@
 #!/bin/sh
 
+if [ -z "$PUSHOVER_USER" ] || [ -z "$PUSHOVER_TOKEN" ]; then
+  echo "Warning: Pushover user and token are not set" >&2 && logger -t notify.sh "pushover credentials cannot be found"
+  exit 1
+fi
+
 if [ "$#" -lt 2 ]; then
   echo "Usage: notify.sh <title> <message>" >&2
   exit 1