diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportRequest.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportRequest.java
index e34cfdd34e..134c979529 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportRequest.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportRequest.java
@@ -311,7 +311,7 @@ public class LwM2MTransportRequest {
             try {
                 sendResponse(registration, path, response, request, lwM2MClient, isDelayedUpdate);
             } catch (Exception e) {
-                log.error("[{}] endpoint [{}] path [{}] error Unable to after send response.", registration.getEndpoint(), path, e);
+                log.error("[{}] endpoint [{}] path [{}] Exception Unable to after send response.", registration.getEndpoint(), path, e);
             }
         });
     }
@@ -321,7 +321,7 @@ public class LwM2MTransportRequest {
             try {
                 if (isDelayedUpdate) lwM2MClient.onSuccessOrErrorDelayedRequests(path);
             } catch (RuntimeException t) {
-                log.error("[{}] endpoint [{}] path [{}] error Unable to after send response.", registration.getEndpoint(), path, t.toString());
+                log.error("[{}] endpoint [{}] path [{}] RuntimeException Unable to after send response.", registration.getEndpoint(), path, t);
             }
         });
     }
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportService.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportService.java
index ac2059b561..ba3cd1f736 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportService.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/LwM2MTransportService.java
@@ -415,7 +415,6 @@ public class LwM2MTransportService {
                 List listV = new ArrayList<TransportProtos.KeyValueProto>();
                 listV.add(v.getKv());
                 this.putDelayedUpdateResourcesClient(lwM2MClient, this.getResourceValueToString(lwM2MClient, k), getJsonObject(listV).get(v.getKv().getKey()), k);
-                System.out.printf("    k: %s, v: %s%n, v1: %s%n", k, v.getKv().getStringV(), this.getResourceValueToString(lwM2MClient, k));
             });
             lwM2MClient.getDelayedRequestsId().remove(attributesResponse.getRequestId());
             if (lwM2MClient.getDelayedRequests().size() == 0) {
@@ -425,7 +424,7 @@ public class LwM2MTransportService {
     }
 
     private void putDelayedUpdateResourcesClient(LwM2MClient lwM2MClient, Object valueOld, Object valueNew, String path) {
-        if (!valueOld.toString().equals(valueNew.toString())) {
+        if (valueNew != null && !valueNew.toString().equals(valueOld.toString())) {
             lwM2MTransportRequest.sendAllRequest(lwM2MClient.getLwServer(), lwM2MClient.getRegistration(), path, POST_TYPE_OPER_WRITE_REPLACE,
                     ContentFormat.TLV.getName(), lwM2MClient, null, valueNew, this.context.getCtxServer().getTimeout(),
                     true);
@@ -1160,7 +1159,7 @@ public class LwM2MTransportService {
     public String getResourceValueToString(LwM2MClient lwM2MClient, String path) {
         LwM2mPath pathIds = new LwM2mPath(path);
         ResourceValue resourceValue = this.getResourceValue(lwM2MClient, pathIds);
-        return (String) this.converter.convertValue(resourceValue.getResourceValue(), this.context.getCtxServer().getResourceModelType(pathIds), ResourceModel.Type.STRING, pathIds);
+        return (resourceValue == null) ? null :
+                (String) this.converter.convertValue(resourceValue.getResourceValue(), this.context.getCtxServer().getResourceModelType(pathIds), ResourceModel.Type.STRING, pathIds);
     }
-
 }
diff --git a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2MClient.java b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2MClient.java
index 89ef741da9..e91f8479e2 100644
--- a/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2MClient.java
+++ b/common/transport/lwm2m/src/main/java/org/thingsboard/server/transport/lwm2m/server/client/LwM2MClient.java
@@ -104,7 +104,6 @@ public class LwM2MClient implements Cloneable {
                 if (objectModel != null) {
                     ((LwM2mObjectInstance)((ReadResponse)resp).getContent()).getResources().forEach((k, v) -> {
                         String rez = pathIds.toString() + "/" + k;
-                        boolean ismulti = objectModel.resources.get(k).multiple;
                         if (objectModel.resources.get(k).multiple){
                             this.resources.put(rez, new ResourceValue(v.getValues(), null, true));
                         }