CLIENT - unhandled error in GUI - ConcurrentModificationException

Error type: CLIENT - unhandled error in GUI - ConcurrentModificationException

Client version: 1.4.57-V2 (build: 2025-04-19 14:23)
Java version: 1.8.0_201
Default charset: UTF-8

ConcurrentModificationException - look at server or client logs for more details

Stack trace:
java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
java.util.ArrayList$Itr.next(ArrayList.java:859)
org.mage.plugins.card.CardPluginImpl.sortPermanents(CardPluginImpl.java:351)
mage.client.plugins.impl.Plugins.sortPermanents(Plugins.java:137)
mage.client.util.layout.impl.CardLayoutStrategyImpl.doLayout(CardLayoutStrategyImpl.java:60)
mage.client.game.BattlefieldPanel.sortLayout(BattlefieldPanel.java:273)
mage.client.game.BattlefieldPanel.updateSize(BattlefieldPanel.java:101)
mage.client.game.BattlefieldPanel$1.componentResized(BattlefieldPanel.java:88)
java.awt.Component.processComponentEvent(Component.java:6365)
java.awt.Component.processEvent(Component.java:6319)
and other 22 lines

Start with org.mage.plugins.card.CardPluginImpl.sortPermanents at line 351, then follow its callers in Plugins.java, CardLayoutStrategyImpl.java, and BattlefieldPanel.java. Use the stack trace to investigate the concurrent modification during GUI layout and verify that resizing or sorting the battlefield no longer produces the reported exception.

Written by the indexing model from the issue text.