diff --git a/edit.php b/edit.php
index 6f3fd20..4424d24 100644
--- a/edit.php
+++ b/edit.php
@@ -82,7 +82,7 @@
   }
 
   // ZSet
-  else if (($_POST['type'] == 'zset') && isset($_POST['score'])) {
+  else if (($_POST['type'] == 'zset') && isset($_POST['score']) && is_numeric($_POST['score'])) {
     // The only way to edit a ZSet value is to add it and remove the old value.
     $redis->zRem($key, encodeOrDecode('save', $key, input_convert($_POST['oldvalue'])));
     $redis->zAdd($key, input_convert($_POST['score']), $value);