diff --git a/src/main/java/org/apache/ibatis/executor/keygen/SelectKeyGenerator.java b/src/main/java/org/apache/ibatis/executor/keygen/SelectKeyGenerator.java
index 9070a625b56..12da50af901 100644
--- a/src/main/java/org/apache/ibatis/executor/keygen/SelectKeyGenerator.java
+++ b/src/main/java/org/apache/ibatis/executor/keygen/SelectKeyGenerator.java
@@ -65,7 +65,7 @@ private void processGeneratedKeys(Executor executor, MappedStatement ms, Object
         // The transaction will be closed by parent executor.
         Executor keyExecutor = configuration.newExecutor(executor.getTransaction(), ExecutorType.SIMPLE);
         List<Object> values = keyExecutor.query(keyStatement, parameter, RowBounds.DEFAULT, Executor.NO_RESULT_HANDLER);
-        if (values.size() == 0) {
+        if (values.isEmpty()) {
           throw new ExecutorException("SelectKey returned no data.");
         }
         if (values.size() > 1) {