diff --git a/sink-las/app/build.gradle b/sink-las/app/build.gradle
index 429496f..39c6580 100644
--- a/sink-las/app/build.gradle
+++ b/sink-las/app/build.gradle
@@ -34,6 +34,8 @@ dependencies {
 
     // LAS
     implementation 'com.bytedance.las:las-sdk-tunnel:1.2.0.16-public'
+
+    implementation 'com.google.guava:guava:33.3.0-jre'
 }
 
 task buildImages(type: Exec) {
diff --git a/sink-las/app/src/main/java/sink/LasSinkTask.java b/sink-las/app/src/main/java/sink/LasSinkTask.java
index 0e7e59c..a593a0c 100644
--- a/sink-las/app/src/main/java/sink/LasSinkTask.java
+++ b/sink-las/app/src/main/java/sink/LasSinkTask.java
@@ -14,6 +14,9 @@
 import lombok.extern.slf4j.Slf4j;
 import org.apache.avro.Schema;
 import org.apache.avro.generic.GenericData;
+import com.google.common.base.Preconditions;
+
+
 
 import java.util.List;
 import java.util.Map;
@@ -144,18 +147,22 @@ GenericData.Record convertRecord(SinkRecord sinkRecord) {
             var lasRecord = LasRecord.fromSinkRecord(sinkRecord);
             // lasRecord should be like: {"key": {"id": 0, ...}, "value": {"id": 0, "name": "...", ...} } ,
             // and this format would be compatible with debezium sources.
+            Map<String, Object> keyRecord = (Map<String,Object>)lasRecord.getRecord().get("key");
             Map<String, Object> valueRecord = (Map<String,Object>)lasRecord.getRecord().get("value");
-            if(valueRecord == null) {
-                valueRecord= lasRecord.getRecord();
-            }
+            Preconditions.checkArgument( keyRecord != null, "input record format error, key field is missing.");
             var r = new GenericData.Record(schema);
-            for (var entry : valueRecord.entrySet()) {
-                var value = entry.getValue();
-                putValue(r, schema, entry.getKey(), value);
+            if(valueRecord == null) {
+                // This represents a deleting row event from CDC source, for LAS sink, we set 'is_deleted' column to true.
+                putValue(r, schema, "is_deleted", true);
+            } else {
+                for (var entry : valueRecord.entrySet()) {
+                    var value = entry.getValue();
+                    putValue(r, schema, entry.getKey(), value);
+                }
             }
             return r;
         } catch (Exception e) {
-            log.warn("convertRecord failed:" + e.getMessage());
+            log.warn("convertRecord failed: " + e.getMessage());
             if (!ctx.getSinkSkipStrategy().trySkip(sinkRecord, e.getMessage())) {
                 throw new ConnectorExceptions.FailFastError(e.getMessage());
             }