diff --git a/qr-web/Dockerfile b/qr-web/Dockerfile
index a382e1a..e782fd3 100644
--- a/qr-web/Dockerfile
+++ b/qr-web/Dockerfile
@@ -4,6 +4,7 @@ WORKDIR /app
 COPY package.json pnpm-lock.yaml* ./
 RUN pnpm install
 COPY . .
+RUN mkdir -p /app/public
 ENV NEXT_TELEMETRY_DISABLED=1
 RUN pnpm run build
 
diff --git a/qr-web/src/components/ExportPanel.tsx b/qr-web/src/components/ExportPanel.tsx
index e72da87..dd39c64 100644
--- a/qr-web/src/components/ExportPanel.tsx
+++ b/qr-web/src/components/ExportPanel.tsx
@@ -35,9 +35,15 @@ export function ExportPanel({ data, recipe, logoUrl, projectName }: ExportPanelP
         return qr;
     }, [data, recipe, logoUrl]);
 
+    const toBlob = (raw: Blob | Buffer | null): Blob | null => {
+        if (!raw) return null;
+        return raw instanceof Blob ? raw : new Blob([raw as BlobPart]);
+    };
+
     const handleSvg = useCallback(async () => {
         const qr = getQrInstance();
-        const blob = await qr.getRawData('svg');
+        const raw = await qr.getRawData('svg');
+        const blob = toBlob(raw);
         if (!blob) return;
         const url = URL.createObjectURL(blob);
         const a = document.createElement('a');
@@ -49,7 +55,8 @@ export function ExportPanel({ data, recipe, logoUrl, projectName }: ExportPanelP
 
     const handlePng = useCallback(async () => {
         const qr = getQrInstance();
-        const blob = await qr.getRawData('png');
+        const raw = await qr.getRawData('png');
+        const blob = toBlob(raw);
         if (!blob) return;
         const url = URL.createObjectURL(blob);
         const a = document.createElement('a');
@@ -61,7 +68,8 @@ export function ExportPanel({ data, recipe, logoUrl, projectName }: ExportPanelP
 
     const handlePdf = useCallback(async () => {
         const qr = getQrInstance();
-        const blob = await qr.getRawData('png');
+        const raw = await qr.getRawData('png');
+        const blob = toBlob(raw);
         if (!blob) return;
         const arrayBuffer = await blob.arrayBuffer();
         const pdfDoc = await PDFDocument.create();
@@ -84,7 +92,7 @@ export function ExportPanel({ data, recipe, logoUrl, projectName }: ExportPanelP
             page.drawText(urlText, { x: 50, y: 60, size: 10 });
         }
         const pdfBytes = await pdfDoc.save();
-        const url = URL.createObjectURL(new Blob([pdfBytes], { type: 'application/pdf' }));
+        const url = URL.createObjectURL(new Blob([pdfBytes as BlobPart], { type: 'application/pdf' }));
         const a = document.createElement('a');
         a.href = url;
         a.download = `qr-${projectName || 'export'}.pdf`.replace(/[^a-z0-9.-]/gi, '-');
diff --git a/qr-web/src/components/ProjectsList.tsx b/qr-web/src/components/ProjectsList.tsx
index ae728ef..9020b57 100644
--- a/qr-web/src/components/ProjectsList.tsx
+++ b/qr-web/src/components/ProjectsList.tsx
@@ -1,6 +1,6 @@
 'use client';
 
-import { Stack, Text, Center } from '@mantine/core';
+import { Stack, Text } from '@mantine/core';
 import classes from './ProjectsList.module.css';
 
 export function ProjectsList() {
diff --git a/qr-web/src/components/QrPreview.tsx b/qr-web/src/components/QrPreview.tsx
index 5d0906c..b200b73 100644
--- a/qr-web/src/components/QrPreview.tsx
+++ b/qr-web/src/components/QrPreview.tsx
@@ -17,7 +17,8 @@ export function QrPreview({ data, recipe, logoUrl, size = 256 }: QrPreviewProps)
     const qrRef = useRef<QRCodeStyling | null>(null);
 
     useEffect(() => {
-        if (!ref.current) return;
+        const el = ref.current;
+        if (!el) return;
         const qr = new QRCodeStyling(
             buildQrStylingOptions(recipe, {
                 width: size,
@@ -27,12 +28,12 @@ export function QrPreview({ data, recipe, logoUrl, size = 256 }: QrPreviewProps)
             }) as ConstructorParameters<typeof QRCodeStyling>[0],
         );
         qrRef.current = qr;
-        qr.append(ref.current);
+        qr.append(el);
         return () => {
-            ref.current?.replaceChildren();
+            el.replaceChildren();
             qrRef.current = null;
         };
-    }, [size]);
+    }, [data, logoUrl, recipe, size]);
 
     useEffect(() => {
         const qr = qrRef.current;