diff --git a/src/xlsx/cells_reader.rs b/src/xlsx/cells_reader.rs
index d4207688..ed5a4c17 100644
--- a/src/xlsx/cells_reader.rs
+++ b/src/xlsx/cells_reader.rs
@@ -333,7 +333,10 @@ fn read_v<'s>(
 ) -> Result<DataRef<'s>, XlsxError> {
     let cell_format = match get_attribute(c_element.attributes(), QName(b"s")) {
         Ok(Some(style)) => {
-            let id: usize = std::str::from_utf8(style).unwrap_or("0").parse()?;
+            let id: usize = match std::str::from_utf8(style).unwrap_or("0").parse() {
+                Ok(parsed_id) => parsed_id,
+                Err(_) => 0,
+            };
             formats.get(id)
         }
         _ => Some(&CellFormat::Other),
diff --git a/tests/empty_s_attribute.xlsx b/tests/empty_s_attribute.xlsx
new file mode 100644
index 00000000..b4e934b8
Binary files /dev/null and b/tests/empty_s_attribute.xlsx differ
diff --git a/tests/test.rs b/tests/test.rs
index 8370d13d..05d6e531 100644
--- a/tests/test.rs
+++ b/tests/test.rs
@@ -1897,3 +1897,26 @@ fn issue_391_shared_formula() {
     assert_eq!(expect.end(), res.end());
     assert!(expect.cells().eq(res.cells()));
 }
+
+#[test]
+fn issue_420_empty_s_attribute() {
+    setup();
+
+    let path = format!(
+        "{}/tests/empty_s_attribute.xlsx",
+        env!("CARGO_MANIFEST_DIR")
+    );
+    let mut excel: Xlsx<_> = open_workbook(&path).unwrap();
+
+    let range = excel.worksheet_range("Sheet1").unwrap();
+    range_eq!(
+        range,
+        [
+            [String("Name".to_string()), String("Value".to_string())],
+            [String("John".to_string()), Float(1.)],
+            [String("Sophia".to_string()), Float(2.)],
+            [String("Peter".to_string()), Float(3.)],
+            [String("Sam".to_string()), Float(4.)],
+        ]
+    );
+}