diff --git a/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala b/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala
index 644603e4710f..fda946e870a0 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/execution/window/WindowFunctionFrame.scala
@@ -123,10 +123,7 @@ abstract class OffsetWindowFunctionFrameBase(
   protected val fillDefaultValue = {
     // Collect the expressions and bind them.
     val boundExpressions = Seq.fill(ordinal)(NoOp) ++ expressions.toImmutableArraySeq.map { e =>
-      if (e.default == null) {
-        // The default value is null.
-        Literal.create(null, e.dataType)
-      } else if (e.default.foldable) {
+      if (e.default.foldable) {
         // The default value is foldable.
         Literal.create(e.default.eval(), e.dataType)
       } else {