Prevent concurrent modification.

diff --git a/src/main/java/net/pterodactylus/rhynodge/triggers/NewEpisodeTrigger.java b/src/main/java/net/pterodactylus/rhynodge/triggers/NewEpisodeTrigger.java
index 9d42572..745a1f8 100644 (file)
--- a/src/main/java/net/pterodactylus/rhynodge/triggers/NewEpisodeTrigger.java
+++ b/src/main/java/net/pterodactylus/rhynodge/triggers/NewEpisodeTrigger.java
@@ -37,6 +37,7 @@ import org.apache.commons.lang3.StringEscapeUtils;
 import com.google.common.base.Function;
 import com.google.common.collect.FluentIterable;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Ordering;
 import com.google.common.collect.Sets;
@@ -85,7 +86,7 @@ public class NewEpisodeTrigger implements Trigger {
                                allEpisodes.put(episode, episode);
                                newEpisodes.add(episode);
                        }
-                       for (TorrentFile torrentFile : episode.torrentFiles()) {
+                       for (TorrentFile torrentFile : Lists.newArrayList(episode.torrentFiles())) {
                                int oldSize = allEpisodes.get(episode).torrentFiles().size();
                                allEpisodes.get(episode).addTorrentFile(torrentFile);
                                int newSize = allEpisodes.get(episode).torrentFiles().size();