From 638eeb8faba5d381c7c48ba11f2f2ae272ac7264 Mon Sep 17 00:00:00 2001
From: Martin Lopez <mlopez@flowingcode.com>
Date: Tue, 26 Nov 2024 17:58:19 -0300
Subject: [PATCH] fix: avoid returning nulls to prevent later NPE

Fixes #163
---
 .../vaadin/addons/gridexporter/BaseStreamResourceWriter.java    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseStreamResourceWriter.java b/src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseStreamResourceWriter.java
index 4dd71a7..6cc22eb 100644
--- a/src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseStreamResourceWriter.java
+++ b/src/main/java/com/flowingcode/vaadin/addons/gridexporter/BaseStreamResourceWriter.java
@@ -162,7 +162,7 @@ private String renderCellTextContent(Grid<T> grid, Column<T> column, String colu
       }
     }
 
-    return headerOrFooter;
+    return headerOrFooter==null?"":headerOrFooter;
   }
 
   protected Stream<T> obtainDataStream(DataProvider<T, ?> dataProvider) {