diff --git a/frontend/src/pages/TimeClockPage.jsx b/frontend/src/pages/TimeClockPage.jsx
index 537f4c2..f3fc682 100644
--- a/frontend/src/pages/TimeClockPage.jsx
+++ b/frontend/src/pages/TimeClockPage.jsx
@@ -136,6 +136,47 @@ const TimeClockPage = () => {
 
   useEffect(() => () => stopScanner(), []);
 
+  useEffect(() => {
+    if (!isScanning || !videoRef.current) return undefined;
+
+    let cancelled = false;
+    const reader = new BrowserQRCodeReader();
+
+    const startReader = async () => {
+      try {
+        const controls = await reader.decodeFromConstraints(
+          { video: { facingMode: { ideal: 'environment' } }, audio: false },
+          videoRef.current,
+          (result) => {
+            if (result && !cancelled) {
+              setScanResult(result.getText());
+              stopScanner();
+            }
+          },
+        );
+
+        if (cancelled) {
+          controls.stop();
+        } else {
+          qrControlsRef.current = controls;
+        }
+      } catch (scannerError) {
+        if (!cancelled) {
+          setError('Impossible d’accéder à la caméra. Vérifiez les permissions et utilisez HTTPS sur le réseau.');
+          console.error(scannerError);
+          stopScanner();
+        }
+      }
+    };
+
+    startReader();
+
+    return () => {
+      cancelled = true;
+      reader.reset();
+    };
+  }, [isScanning]);
+
   const startScanner = async () => {
     setError('');
     setScanResult('');
@@ -152,17 +193,6 @@ const TimeClockPage = () => {
       }
 
       setIsScanning(true);
-      const reader = new BrowserQRCodeReader();
-      qrControlsRef.current = await reader.decodeFromConstraints(
-        { video: { facingMode: { ideal: 'environment' } }, audio: false },
-        videoRef.current,
-        (result) => {
-          if (result) {
-            setScanResult(result.getText());
-            stopScanner();
-          }
-        },
-      );
     } catch (scannerError) {
       setError('Impossible d’accéder à la caméra. Vérifiez les permissions et utilisez HTTPS sur le réseau.');
       console.error(scannerError);
diff --git a/start.sh b/start.sh
index 464c179..0928459 100644
--- a/start.sh
+++ b/start.sh
@@ -49,10 +49,8 @@ BACKEND_PID=$!
 
 cd /home/container/frontend
 
-if [ ! -x "node_modules/.bin/vite" ]; then
-    echo "node_modules absent → installation npm..."
-    npm ci
-fi
+echo "Installation des dépendances frontend..."
+npm ci
 
 
 echo "Build React..."