From d9e358d5361f33a16a44ed5a42092d4d916498db Mon Sep 17 00:00:00 2001
From: "honfika@gmail.com" <honfika@gmail.com>
Date: Thu, 9 Jul 2015 15:09:25 +0200
Subject: [PATCH] cancellable worker fix

---
 libsrc/ffdec_lib/src/com/jpexs/helpers/CancellableWorker.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libsrc/ffdec_lib/src/com/jpexs/helpers/CancellableWorker.java b/libsrc/ffdec_lib/src/com/jpexs/helpers/CancellableWorker.java
index 61a15a1c0..12ed75a03 100644
--- a/libsrc/ffdec_lib/src/com/jpexs/helpers/CancellableWorker.java
+++ b/libsrc/ffdec_lib/src/com/jpexs/helpers/CancellableWorker.java
@@ -128,7 +128,7 @@ public abstract class CancellableWorker<T> implements RunnableFuture<T> {
 
     public static void cancelBackgroundThreads() {
         List<CancellableWorker> oldWorkers = workers;
-        workers = new ArrayList<>();
+        workers = Collections.synchronizedList(new ArrayList<CancellableWorker>());
         for (CancellableWorker worker : oldWorkers) {
             if (worker != null) {
                 worker.cancel(true);