diff --git a/index.js b/index.js
index abb306a..c0ebd60 100644
--- a/index.js
+++ b/index.js
@@ -123,7 +123,7 @@ async function sendSummary() {
     await records.toJSONFile(JSON_FILE);
 
     const yesterday = getYesterday();
-    const makeField = (name, value) => ({ name, value: value.toString(), inline: false });
+    const makeField = (name, value) => ({ name, value: value === undefined ? "***ERR: UNDEFINED***" : value.toString(), inline: false });
 
     let embed = {
         title: `Summary from <t:${Math.floor(yesterday.start / 1000)}:f> to <t:${Math.floor(yesterday.end / 1000)}:f>`,