.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "read-excel-file",
-  "version": "5.2.27",
+  "version": "5.2.28",
   "description": "Read small to medium `*.xlsx` files in a browser or Node.js. Parse to JSON with a strict schema.",
   "module": "index.js",
   "sideEffects": false,

source/read/getData.js

@@ -32,7 +32,7 @@ export default function getData(sheet, options) {
     i++
   }
 
-  // Fill in spreadsheet data structure.
+  // Fill in spreadsheet `data`.
   // (this code implies that `cells` aren't necessarily sorted by row and column:
   //  maybe that's not correct, this piece code was initially copy-pasted
   //  from some other library that used `XPath`)
@@ -43,7 +43,10 @@ export default function getData(sheet, options) {
     // const columnIndex = cell.column - leftTop.column
     const rowIndex = cell.row - 1
     const columnIndex = cell.column - 1
-    data[rowIndex][columnIndex] = cell.value
+    // Ignore the data in the cell if it's outside of the spreadsheet's "dimensions".
+    if (columnIndex < colsCount && rowIndex < rowsCount) {
+      data[rowIndex][columnIndex] = cell.value
+    }
   }
 
   // Fill in the row map.

source/read/parseDimensions.js

@@ -15,8 +15,13 @@ export default function parseDimensions(sheet) {
       row,
       column
     }))
-    // When there's only a single cell on a sheet
-    // there can sometimes be just "A1" for the dimensions string.
+    // Sometimes there can be just a single cell as a spreadsheet's "dimensions".
+    // For example, the default "dimensions" in Apache POI library is "A1",
+    // meaning that only the first cell in the spreadsheet is used.
+    //
+    // A quote from Apache POI library:
+    // "Single cell ranges are formatted like single cell references (e.g. 'A1' instead of 'A1:A1')."
+    //
     if (dimensions.length === 1) {
       dimensions = [dimensions[0], dimensions[0]]
     }