1 files changed, 31 insertions, 18 deletions
diff --git a/packages/merchant-backend-ui/src/components/QR.tsx b/packages/merchant-backend-ui/src/components/QR.tsx
index 29c9920bf..425a94961 100644
--- a/packages/merchant-backend-ui/src/components/QR.tsx
+++ b/packages/merchant-backend-ui/src/components/QR.tsx
@@ -14,28 +14,41 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
- import { h, VNode } from "preact";
- import { useEffect, useRef } from "preact/hooks";
- import qrcode from "qrcode-generator";
- 
-export function createSVG(text:string):string {
-  const qr = qrcode(0, 'L');
+import { h, VNode } from "preact";
+import { useEffect, useRef } from "preact/hooks";
+import qrcode from "qrcode-generator";
+
+export function createSVG(text: string): string {
+  const qr = qrcode(0, "L");
   qr.addData(text);
   qr.make();
   return qr.createSvgTag({
     scalable: true,
-    margin: 0
+    margin: 0,
   });
 }
 
- export function QR({ text }: { text: string; }):VNode {
-   const divRef = useRef<HTMLDivElement>(null);
-   useEffect(() => {
-     divRef.current.innerHTML = createSVG(text)
-   });
- 
-   return <div style={{ width: '100%', display: 'flex', flexDirection: 'column', alignItems: 'center' }}>
-     <div style={{ width: '50%', minWidth: 200, maxWidth: 300 }} ref={divRef} />
-   </div>;
- }
- 
-\ No newline at end of file
+export function QR({ text }: { text: string }): VNode {
+  const divRef = useRef<HTMLDivElement>(null);
+  useEffect(() => {
+    if (divRef.current) {
+      divRef.current.innerHTML = createSVG(text);
+    }
+  });
+
+  return (
+    <div
+      style={{
+        width: "100%",
+        display: "flex",
+        flexDirection: "column",
+        alignItems: "center",
+      }}
+    >
+      <div
+        style={{ width: "50%", minWidth: 200, maxWidth: 300 }}
+        ref={divRef}
+      />
+    </div>
+  );
+}