From 9e869ae69be47e8260beec404f822da87acb31df Mon Sep 17 00:00:00 2001
From: Craig Raw <craigraw@gmail.com>
Date: Wed, 7 Apr 2021 09:56:51 +0200
Subject: [PATCH] handle no camera detected better

---
 .../com/sparrowwallet/sparrow/control/WebcamService.java  | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/main/java/com/sparrowwallet/sparrow/control/WebcamService.java b/src/main/java/com/sparrowwallet/sparrow/control/WebcamService.java
index 467b391e..7c23685f 100644
--- a/src/main/java/com/sparrowwallet/sparrow/control/WebcamService.java
+++ b/src/main/java/com/sparrowwallet/sparrow/control/WebcamService.java
@@ -18,6 +18,7 @@ import javafx.scene.image.Image;
 
 import java.awt.image.BufferedImage;
 import java.util.Arrays;
+import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 public class WebcamService extends ScheduledService<Image> {
@@ -47,7 +48,12 @@ public class WebcamService extends ScheduledService<Image> {
             protected Image call() throws Exception {
                 try {
                     if(cam == null) {
-                        cam = Webcam.getWebcams(1, TimeUnit.MINUTES).get(0);
+                        List<Webcam> webcams = Webcam.getWebcams(1, TimeUnit.MINUTES);
+                        if(webcams.isEmpty()) {
+                            throw new UnsupportedOperationException("No camera available.");
+                        }
+
+                        cam = webcams.get(0);
                         cam.setCustomViewSizes(resolution.getSize());
                         cam.setViewSize(resolution.getSize());
                         if(!Arrays.asList(cam.getWebcamListeners()).contains(listener)) {