diff --git a/application/src/main/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtils.java b/application/src/main/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtils.java
index e1c7f1198c..33084f98fa 100644
--- a/application/src/main/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtils.java
+++ b/application/src/main/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtils.java
@@ -560,7 +560,7 @@ public class EdgeMsgConstructorUtils {
                 .setEntityIdMSB(entityId.getId().getMostSignificantBits())
                 .setEntityIdLSB(entityId.getId().getLeastSignificantBits())
                 .setEntityType(entityId.getEntityType().name());
-        long ts = getTs(entityData.getAsJsonObject());
+        long ts = extractTs(entityData.getAsJsonObject());
         switch (actionType) {
             case TIMESERIES_UPDATED:
                 try {
@@ -613,8 +613,8 @@ public class EdgeMsgConstructorUtils {
         return builder.build();
     }
 
-    private static long getTs(JsonObject data) {
-        if (data.get("ts") != null && !data.get("ts").isJsonNull()) {
+    private static long extractTs(JsonObject data) {
+        if (data.has("ts") && data.get("ts").isJsonPrimitive()) {
             return data.getAsJsonPrimitive("ts").getAsLong();
         }
         return System.currentTimeMillis();
@@ -740,7 +740,7 @@ public class EdgeMsgConstructorUtils {
             result.sort(Comparator.comparingLong(EdgeEvent::getSeqId));
             return result;
         } catch (Exception e) {
-            log.warn("Can't merge downlink duplicates, edgeEvents [{}]", edgeEvents, e);
+            log.info("Can't merge downlink duplicates. Sending downlinks without merge. Original edgeEvents [{}]", edgeEvents, e);
             return edgeEvents;
         }
     }
@@ -751,6 +751,9 @@ public class EdgeMsgConstructorUtils {
         }
         String bodyStr = JacksonUtil.toString(body);
         var jsonObject = JsonParser.parseString(bodyStr).getAsJsonObject();
+        if (!jsonObject.has("ts")) {
+            return new AttrsTs(0L, List.of());
+        }
         long ts = jsonObject.get("ts").getAsLong();
         var kv = jsonObject.getAsJsonObject("kv");
         List<AttributeKvEntry> attrs = JsonConverter.convertToAttributes(
@@ -761,22 +764,24 @@ public class EdgeMsgConstructorUtils {
     }
 
     private static JsonNode filterAttributesBody(JsonNode body, Map<String, Long> latestByKey) {
-        if (body == null || latestByKey == null || latestByKey.isEmpty()) {
+        if (body == null) {
             return null;
         }
         String bodyStr = JacksonUtil.toString(body);
         JsonObject jsonObject = JsonParser.parseString(bodyStr).getAsJsonObject();
-        long ts = jsonObject.get("ts").getAsLong();
-        JsonObject kv = jsonObject.getAsJsonObject("kv");
-        for (Iterator<Map.Entry<String, JsonElement>> it = kv.entrySet().iterator(); it.hasNext(); ) {
-            Map.Entry<String, JsonElement> e = it.next();
-            Long latestTs = latestByKey.get(e.getKey());
-            if (latestTs == null || !latestTs.equals(ts)) {
-                it.remove();
+        if (jsonObject.has("ts") && latestByKey != null && !latestByKey.isEmpty()) {
+            long ts = jsonObject.get("ts").getAsLong();
+            JsonObject kv = jsonObject.getAsJsonObject("kv");
+            for (Iterator<Map.Entry<String, JsonElement>> it = kv.entrySet().iterator(); it.hasNext(); ) {
+                Map.Entry<String, JsonElement> e = it.next();
+                Long latestTs = latestByKey.get(e.getKey());
+                if (latestTs == null || !latestTs.equals(ts)) {
+                    it.remove();
+                }
+            }
+            if (kv.isEmpty()) {
+                return null;
             }
-        }
-        if (kv.isEmpty()) {
-            return null;
         }
         return JacksonUtil.toJsonNode(jsonObject.toString());
     }
diff --git a/application/src/test/java/org/thingsboard/server/edge/DeviceEdgeTest.java b/application/src/test/java/org/thingsboard/server/edge/DeviceEdgeTest.java
index 380dec8015..5c3f43b451 100644
--- a/application/src/test/java/org/thingsboard/server/edge/DeviceEdgeTest.java
+++ b/application/src/test/java/org/thingsboard/server/edge/DeviceEdgeTest.java
@@ -49,8 +49,6 @@ import org.thingsboard.server.common.data.id.DeviceId;
 import org.thingsboard.server.common.data.id.EdgeId;
 import org.thingsboard.server.common.data.id.EntityId;
 import org.thingsboard.server.common.data.ota.OtaPackageType;
-import org.thingsboard.server.common.data.page.PageData;
-import org.thingsboard.server.common.data.page.PageLink;
 import org.thingsboard.server.common.data.security.DeviceCredentials;
 import org.thingsboard.server.common.data.security.DeviceCredentialsType;
 import org.thingsboard.server.common.data.tenant.profile.DefaultTenantProfileConfiguration;
@@ -671,8 +669,7 @@ public class DeviceEdgeTest extends AbstractEdgeTest {
                 .atMost(10, TimeUnit.SECONDS)
                 .until(() -> {
                     String urlTemplate = "/api/plugins/telemetry/DEVICE/" + device.getId() + "/keys/attributes/" + scope;
-                    List<String> actualKeys = doGetAsyncTyped(urlTemplate, new TypeReference<>() {
-                    });
+                    List<String> actualKeys = doGetAsyncTyped(urlTemplate, new TypeReference<>() {});
                     return actualKeys != null && !actualKeys.isEmpty() && actualKeys.contains(expectedKey);
                 });
 
diff --git a/application/src/test/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtilsTest.java b/application/src/test/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtilsTest.java
index ebb8305871..1e268e3bcb 100644
--- a/application/src/test/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtilsTest.java
+++ b/application/src/test/java/org/thingsboard/server/service/edge/EdgeMsgConstructorUtilsTest.java
@@ -230,10 +230,35 @@ public class EdgeMsgConstructorUtilsTest {
         Assertions.assertEquals(8, getIntValue(assetMergedAttrAD.getBody(), "d"));
     }
 
+    @Test
+    public void testMergeDownlinkDuplicates_attrBodyHasNoTs_returnOriginalList() {
+        UUID deviceId = UUID.randomUUID();
+        TenantId tenantId = TenantId.fromUUID(UUID.randomUUID());
+
+        var deviceAttrUpdate1 = createEdgeEvent(tenantId, 1, EdgeEventActionType.ATTRIBUTES_UPDATED,
+                deviceId, EdgeEventType.DEVICE, createAttrBodyWithoutTs("{\"a\":1,\"b\":1,\"d\":1}"));
+        var deviceAttrUpdate2 = createEdgeEvent(tenantId, 2, EdgeEventActionType.ATTRIBUTES_UPDATED,
+                deviceId, EdgeEventType.DEVICE, createAttrBodyWithoutTs("{\"a\":2,\"b\":2,\"c\":2}"));
+        var deviceAttrUpdate3 = createEdgeEvent(tenantId, 3, EdgeEventActionType.ATTRIBUTES_UPDATED,
+                deviceId, EdgeEventType.DEVICE, createAttrBodyWithoutTs("{\"a\":3,\"d\":3}"));
+
+        List<EdgeEvent> input = List.of(deviceAttrUpdate1, deviceAttrUpdate2, deviceAttrUpdate3);
+        List<EdgeEvent> merged = EdgeMsgConstructorUtils.mergeAndFilterDownlinkDuplicates(input);
+
+        Assertions.assertEquals(3, merged.size());
+        Assertions.assertEquals(deviceAttrUpdate1, merged.get(0));
+        Assertions.assertEquals(deviceAttrUpdate2, merged.get(1));
+        Assertions.assertEquals(deviceAttrUpdate3, merged.get(2));
+    }
+
     private Integer getIntValue(JsonNode body, String key) {
         return body.get("kv").get(key) != null ? body.get("kv").get(key).asInt() : null;
     }
 
+    private static JsonNode createAttrBodyWithoutTs(String kvJson) {
+        return JacksonUtil.toJsonNode("{\"kv\":" + kvJson + "}");
+    }
+
     private static JsonNode createAttrBody(long ts, String kvJson) {
         return JacksonUtil.toJsonNode("{\"ts\":" + ts + ",\"kv\":" + kvJson + "}");
     }