Index: /applications/editors/josm/plugins/reverter/src/reverter/RevertChangesetTask.java
===================================================================
--- /applications/editors/josm/plugins/reverter/src/reverter/RevertChangesetTask.java	(revision 35687)
+++ /applications/editors/josm/plugins/reverter/src/reverter/RevertChangesetTask.java	(revision 35688)
@@ -172,10 +172,12 @@
             return null;
         }
-        for (Command c : cmds) {
-            if (c instanceof ConflictAddCommand) {
-                numberOfConflicts++;
-            }
-            c.executeCommand();
-        }
+        GuiHelper.runInEDT(() -> {
+        	for (Command c : cmds) {
+        		if (c instanceof ConflictAddCommand) {
+        			numberOfConflicts++;
+        		}
+        		c.executeCommand();
+        	}
+        });
         final String desc;
         if (revertType == RevertType.FULL) {