Stop scanner when cancelling

src/views/ContactQRScanView.vue

@@ -11,7 +11,7 @@
 		<div class="text-center">
 			<button
 				class="text-center text-white leading-none bg-slate-400 p-2 rounded-full"
-				@click="$router.back()"
+				@click="handleBack"
 			>
 				<font-awesome icon="xmark" class="w-[1em]"></font-awesome>
 			</button>
@@ -416,6 +416,11 @@ export default class ContactQRScan extends Vue {
     logger.info("App resumed, scanner can be restarted by user");
     this.isScanning = false;
   }
+
+  async handleBack() {
+    await this.cleanupScanner();
+    this.$router.back();
+  }
 }
 </script>