diff --git a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmOperationResult.java b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmOperationResult.java
index b47aba3d88..28fad9adc5 100644
--- a/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmOperationResult.java
+++ b/common/dao-api/src/main/java/org/thingsboard/server/dao/alarm/AlarmOperationResult.java
@@ -51,5 +51,6 @@ public class AlarmOperationResult {
         this.successful = successful;
         this.created = created;
         this.propagatedEntitiesList = propagatedEntitiesList;
+        this.oldSeverity = null;
     }
 }