diff --git a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
index 69302033..aa864ebc 100755
--- a/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
+++ b/broker/src/main/java/io/moquette/persistence/MemoryMessagesStore.java
@@ -1870,7 +1870,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         }
 
         if (existRequest != null && existRequest.getStatus() != ProtoConstants.FriendRequestStatus.RequestStatus_Accepted) {
-            if (System.currentTimeMillis() - existRequest.getUpdateDt() > mFriendRequestDuration) {
+            if (mFriendRequestDuration > 0 && System.currentTimeMillis() - existRequest.getUpdateDt() > mFriendRequestDuration) {
                 if (existRequest.getStatus() == ProtoConstants.FriendRequestStatus.RequestStatus_Rejected
                     && System.currentTimeMillis() - existRequest.getUpdateDt() < mFriendRejectDuration) {
                     return ErrorCode.ERROR_CODE_FRIEND_REQUEST_BLOCKED;
@@ -2004,7 +2004,7 @@ public class MemoryMessagesStore implements IMessagesStore {
         }
 
         if (existRequest != null) {
-            if (System.currentTimeMillis() - existRequest.getUpdateDt() > mFriendRequestDuration) {
+            if (mFriendRequestDuration > 0 && System.currentTimeMillis() - existRequest.getUpdateDt() > mFriendRequestDuration) {
                 return ErrorCode.ERROR_CODE_FRIEND_REQUEST_OVERTIME;
             } else {
                 existRequest = existRequest.toBuilder().setStatus(ProtoConstants.FriendRequestStatus.RequestStatus_Accepted).setUpdateDt(System.currentTimeMillis()).build();