diff --git a/server/bundles/io.cloudbeaver.server/schema/service.sql.graphqls b/server/bundles/io.cloudbeaver.server/schema/service.sql.graphqls
index 520ea94c2e..beaef2d1ff 100644
--- a/server/bundles/io.cloudbeaver.server/schema/service.sql.graphqls
+++ b/server/bundles/io.cloudbeaver.server/schema/service.sql.graphqls
@@ -309,8 +309,8 @@ extend type Mutation {
         connectionId: ID!,
         contextId: ID!,
         resultsId: ID!,
-        lobColumnIndex: ID!,
-        row: [ SQLResultRow! ]
+        lobColumnIndex: Int!,
+        row: [ SQLResultRow! ]!
     ): String!
 
     # Returns SQLExecuteInfo
diff --git a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/DBWServiceSQL.java b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/DBWServiceSQL.java
index fcbca1e78e..0ddeaee025 100644
--- a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/DBWServiceSQL.java
+++ b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/DBWServiceSQL.java
@@ -111,7 +111,7 @@ public interface DBWServiceSQL extends DBWService {
     String readLobValue(
             @NotNull WebSQLContextInfo contextInfo,
             @NotNull String resultsId,
-            @NotNull String lobColumnIndex,
+            @NotNull Integer lobColumnIndex,
             @Nullable List<WebSQLResultsRow> row) throws DBWebException;
 
     @WebAction
diff --git a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/WebSQLProcessor.java b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/WebSQLProcessor.java
index 811708c74c..b32ea4db84 100644
--- a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/WebSQLProcessor.java
+++ b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/WebSQLProcessor.java
@@ -610,7 +610,7 @@ public class WebSQLProcessor implements WebSessionProvider {
             @NotNull DBRProgressMonitor monitor,
             @NotNull WebSQLContextInfo contextInfo,
             @NotNull String resultsId,
-            @NotNull String lobColumnIndex,
+            @NotNull Integer lobColumnIndex,
             @Nullable WebSQLResultsRow row) throws DBException {
         WebSQLResultsInfo resultsInfo = contextInfo.getResults(resultsId);
 
@@ -619,7 +619,7 @@ public class WebSQLProcessor implements WebSessionProvider {
         DBSEntity dataContainer = rowIdentifier.getEntity();
         DBSDataManipulator dataManipulator = (DBSDataManipulator) dataContainer;
         DBCExecutionContext executionContext = getExecutionContext(dataManipulator);
-        WebSQLDataLOBReceiver dataReceiver = new WebSQLDataLOBReceiver(contextInfo, dataManipulator, CommonUtils.toInt(lobColumnIndex));
+        WebSQLDataLOBReceiver dataReceiver = new WebSQLDataLOBReceiver(contextInfo, dataManipulator, lobColumnIndex);
         try (DBCSession session = executionContext.openSession(monitor, DBCExecutionPurpose.USER, "Generate data update batches")) {
             WebExecutionSource executionSource = new WebExecutionSource(dataManipulator, executionContext, this);
             DBDDataFilter dataFilter = new DBDDataFilter();
diff --git a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/impl/WebServiceSQL.java b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/impl/WebServiceSQL.java
index 0df6c3c300..e8b5d88d1f 100644
--- a/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/impl/WebServiceSQL.java
+++ b/server/bundles/io.cloudbeaver.server/src/io/cloudbeaver/service/sql/impl/WebServiceSQL.java
@@ -312,7 +312,7 @@ public class WebServiceSQL implements DBWServiceSQL {
     public String readLobValue(
             @NotNull WebSQLContextInfo contextInfo,
             @NotNull String resultsId,
-            @NotNull String lobColumnIndex,
+            @NotNull Integer lobColumnIndex,
             @Nullable List<WebSQLResultsRow> row) throws DBWebException
     {
         try {