diff --git a/static/index.html b/static/index.html
index 7eed1e0..574a532 100644
--- a/static/index.html
+++ b/static/index.html
@@ -2885,7 +2885,12 @@
         if (!video) return;
 
         // Create reader with 1D-only hints for fast, accurate scanning
-        codeReader = new ZXing.BrowserMultiFormatReader(_barcodeHints(), _barcodeOptions());
+        // NOTE: BrowserMultiFormatReader constructor takes 0 args — hints and options
+        // must be set as instance properties for them to take effect.
+        codeReader = new ZXing.BrowserMultiFormatReader();
+        codeReader.reader.hints = _barcodeHints();
+        codeReader.timeBetweenScansMillis = 2000;  // delayBetweenScanSuccess
+        codeReader._timeBetweenDecodingAttempts = 300; // delayBetweenScanAttempts
 
         // Pick the rear-facing camera (environment-facing on phones)
         let deviceId = null;
@@ -2927,8 +2932,13 @@
               handleBarcode(val.trim());
             }
           } else if (err && scanningActive) {
-            const msg = (err.message || err || '').toLowerCase();
-            if (!msg.includes('multiformat') && !msg.includes('unable to detect')) {
+            // NotFoundException, ChecksumException, FormatException are normal
+            // "no barcode on this frame" results — silently continue scanning.
+            // We use instanceof because ZXing's minified exception classes all
+            // have message="undefined", making message-text filtering unreliable.
+            if (!(err instanceof ZXing.NotFoundException ||
+                  err instanceof ZXing.ChecksumException ||
+                  err instanceof ZXing.FormatException)) {
               console.error('ZXing camera error:', err);
               handleCameraError(new Error(err.message || err));
             }