diff --git a/core/src/com/google/zxing/oned/Code128Reader.java b/core/src/com/google/zxing/oned/Code128Reader.java
index f39d91f85..0865cc8a5 100644
--- a/core/src/com/google/zxing/oned/Code128Reader.java
+++ b/core/src/com/google/zxing/oned/Code128Reader.java
@@ -420,10 +420,11 @@ public final class Code128Reader extends OneDReader {
     // Check for ample whitespace following pattern, but, to do this we first need to remember that
     // we fudged decoding CODE_STOP since it actually has 7 bars, not 6. There is a black bar left
     // to read off. Would be slightly better to properly read. Here we just skip it:
-    while (row.get(nextStart)) {
+    int width = row.getSize();
+    while (nextStart < width && row.get(nextStart)) {
       nextStart++;
     }
-    if (!row.isRange(nextStart, Math.min(row.getSize(), nextStart + (nextStart - lastStart) / 2),
+    if (!row.isRange(nextStart, Math.min(width, nextStart + (nextStart - lastStart) / 2),
         false)) {
       throw ReaderException.getInstance();
     }