diff --git a/src/main/java/club/joylink/rtss/simulation/cbtc/conversation/ConversationGroupHandlerService.java b/src/main/java/club/joylink/rtss/simulation/cbtc/conversation/ConversationGroupHandlerService.java
index ba28c121f..5d12b3d97 100644
--- a/src/main/java/club/joylink/rtss/simulation/cbtc/conversation/ConversationGroupHandlerService.java
+++ b/src/main/java/club/joylink/rtss/simulation/cbtc/conversation/ConversationGroupHandlerService.java
@@ -351,7 +351,10 @@ public class ConversationGroupHandlerService {
     private ConversationGroup getPrivateConversation(Simulation simulation, SimulationMember member, String memberId) {
         SimulationMember communicator = simulation.getSimulationMemberById(memberId);
         ConversationGroup conversationGroup = simulation.getSimulationConversationGroupMap().values()
-                .stream().filter(group -> group.isPrivate() && group.contains(communicator)).findFirst().orElse(null);
+                .stream().filter(group -> {
+                    int memberNumber = Objects.equals(member.getId(), memberId) ? 1 : 2;
+                    return group.getMemberList().size() == memberNumber && group.isPrivate() && group.contains(communicator);
+                }).findFirst().orElse(null);
         if (conversationGroup == null) {
             Long groupId = simulation.getMaxConversationGroupId();
             conversationGroup = new ConversationGroup(groupId, null, null, simulation.getCorrectSystemTime(),