CLIENT - unhandled error in GUI - ConcurrentModificationException

Error type: CLIENT - unhandled error in GUI - ConcurrentModificationException

Client version: 1.4.58-V1 (build: 2025-10-06 20:20)
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:356)
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.changeGUISize(BattlefieldPanel.java:125)
mage.client.game.PlayAreaPanel.changeGUISize(PlayAreaPanel.java:102)
mage.client.game.GamePanel.changeGUISize(GamePanel.java:498)
mage.client.game.GamePane.changeGUISize(GamePane.java:44)
and other 4 lines

Start with org.mage.plugins.card.CardPluginImpl.sortPermanents at line 356 and follow the callers in Plugins.sortPermanents, CardLayoutStrategyImpl.doLayout, and BattlefieldPanel.changeGUISize. Reproduce or investigate the ConcurrentModificationException during GUI resizing using the reported client and Java versions. Done means resizing the GUI no longer produces this unhandled exception.

Written by the indexing model from the issue text.