diff --git a/ids.js b/ids.js
index ba21b50..21d1d4c 100644
--- a/ids.js
+++ b/ids.js
@@ -50,6 +50,7 @@ async function fetchRegularCells(sheet) {
   let rowID = 1;
   let previousTier = 'penis tier :33';
   while (true) {
+    if (rowID >= sheet.rowCount) break;
     const cell = sheet.getCell(rowID, 0);
     if (!cell || cell == null || cell.value == null) break;
     const color = cell.backgroundColor || {};
diff --git a/nlw.js b/nlw.js
index f1320fc..547587f 100644
--- a/nlw.js
+++ b/nlw.js
@@ -43,6 +43,7 @@ async function fetchRegularCells(sheet) {
 
   let rowID = 0;
   while (true) {
+    if (rowID >= sheet.rowCount) break;
     const cell = sheet.getCell(rowID, 0);
     if (!cell || cell == null) break;
     try {