diff --git a/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbEntityDataSubscriptionService.java b/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbEntityDataSubscriptionService.java
index 10e342b1e8..984af019b4 100644
--- a/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbEntityDataSubscriptionService.java
+++ b/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbEntityDataSubscriptionService.java
@@ -95,7 +95,8 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     private static final int DEFAULT_LIMIT = 100;
     private final Map<String, Map<Integer, TbAbstractSubCtx>> subscriptionsBySessionId = new ConcurrentHashMap<>();
 
-    @Autowired @Lazy
+    @Autowired
+    @Lazy
     private WebSocketService wsService;
 
     @Autowired
@@ -728,7 +729,14 @@ public class DefaultTbEntityDataSubscriptionService implements TbEntityDataSubsc
     public void cancelAllSessionSubscriptions(String sessionId) {
         Map<Integer, TbAbstractSubCtx> sessionSubs = subscriptionsBySessionId.remove(sessionId);
         if (sessionSubs != null) {
-            sessionSubs.values().forEach(this::cleanupAndCancel);
+            sessionSubs.values().forEach(sub -> {
+                        try {
+                            cleanupAndCancel(sub);
+                        } catch (Exception e) {
+                            log.warn("[{}] Failed to remove subscription {} due to ", sub.getTenantId(), sub, e);
+                        }
+                    }
+            );
         }
     }
 
diff --git a/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbLocalSubscriptionService.java b/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbLocalSubscriptionService.java
index bcb900c3f0..a280ae6754 100644
--- a/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbLocalSubscriptionService.java
+++ b/application/src/main/java/org/thingsboard/server/service/subscription/DefaultTbLocalSubscriptionService.java
@@ -217,7 +217,11 @@ public class DefaultTbLocalSubscriptionService implements TbLocalSubscriptionSer
         Map<Integer, TbSubscription<?>> sessionSubscriptions = subscriptionsBySessionId.remove(sessionId);
         if (sessionSubscriptions != null) {
             for (TbSubscription<?> subscription : sessionSubscriptions.values()) {
-                modifySubscription(subscription.getTenantId(), subscription.getEntityId(), subscription, false);
+                try {
+                    modifySubscription(subscription.getTenantId(), subscription.getEntityId(), subscription, false);
+                } catch (Exception e) {
+                    log.warn("[{}][{}] Failed to remove subscription {} due to ", subscription.getTenantId(), subscription.getEntityId(), subscription, e);
+                }
             }
         } else {
             log.debug("[{}] No session subscriptions found!", sessionId);
diff --git a/application/src/main/java/org/thingsboard/server/service/ws/DefaultWebSocketService.java b/application/src/main/java/org/thingsboard/server/service/ws/DefaultWebSocketService.java
index e41d1821c1..78b78d8b8c 100644
--- a/application/src/main/java/org/thingsboard/server/service/ws/DefaultWebSocketService.java
+++ b/application/src/main/java/org/thingsboard/server/service/ws/DefaultWebSocketService.java
@@ -197,7 +197,8 @@ public class DefaultWebSocketService implements WebSocketService {
                 wsSessionsMap.put(sessionId, new WsSessionMetaData(sessionRef));
                 break;
             case ERROR:
-                log.debug("[{}] Unknown websocket session error: {}. ", sessionId, event.getError().orElse(null));
+                log.debug("[{}] Unknown websocket session error: ", sessionId,
+                        event.getError().orElse(new RuntimeException("No error specified")));
                 break;
             case CLOSED:
                 wsSessionsMap.remove(sessionId);
diff --git a/application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionRef.java b/application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionRef.java
index 190183cce2..44919b138c 100644
--- a/application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionRef.java
+++ b/application/src/main/java/org/thingsboard/server/service/ws/WebSocketSessionRef.java
@@ -33,7 +33,7 @@ public class WebSocketSessionRef {
     private static final long serialVersionUID = 1L;
 
     private final String sessionId;
-    private SecurityUser securityCtx;
+    private volatile SecurityUser securityCtx;
     private final InetSocketAddress localAddress;
     private final InetSocketAddress remoteAddress;
     private final WebSocketSessionType sessionType;