diff --git a/kernel/sql-federation/optimizer/src/main/java/org/apache/shardingsphere/sqlfederation/optimizer/converter/segment/from/impl/SimpleTableConverter.java b/kernel/sql-federation/optimizer/src/main/java/org/apache/shardingsphere/sqlfederation/optimizer/converter/segment/from/impl/SimpleTableConverter.java
index a7e29139b076e..b79481c0e802a 100644
--- a/kernel/sql-federation/optimizer/src/main/java/org/apache/shardingsphere/sqlfederation/optimizer/converter/segment/from/impl/SimpleTableConverter.java
+++ b/kernel/sql-federation/optimizer/src/main/java/org/apache/shardingsphere/sqlfederation/optimizer/converter/segment/from/impl/SimpleTableConverter.java
@@ -55,7 +55,7 @@ public static Optional<SqlNode> convert(final SimpleTableSegment segment) {
             addOwnerNames(names, segment.getOwner().get());
         }
         names.add(tableName.getIdentifier().getValue());
-        if (segment.getDbLink().isPresent()) {
+        if (segment.getDbLink().isPresent() && segment.getAt().isPresent()) {
             names.add(segment.getAt().get().getValue());
             names.add(segment.getDbLink().get().getValue());
         }