1 files changed, 8 insertions, 2 deletions
diff --git a/poi-ooxml/src/main/java/org/apache/poi/xssf/streaming/StreamingSheetWriter.java b/poi-ooxml/src/main/java/org/apache/poi/xssf/streaming/StreamingSheetWriter.java
index 173e6963bd..1e467244f5 100644
--- a/poi-ooxml/src/main/java/org/apache/poi/xssf/streaming/StreamingSheetWriter.java
+++ b/poi-ooxml/src/main/java/org/apache/poi/xssf/streaming/StreamingSheetWriter.java
@@ -37,6 +37,7 @@ import org.apache.poi.util.Beta;
 @Beta
 public class StreamingSheetWriter extends SheetDataWriter {
     private static final Logger LOG = LogManager.getLogger(StreamingSheetWriter.class);
+    private boolean closed = false;
 
     public StreamingSheetWriter() throws IOException {
         throw new RuntimeException("StreamingSheetWriter requires OutputStream");
@@ -68,7 +69,9 @@ public class StreamingSheetWriter extends SheetDataWriter {
 
     @Override
     public void close() throws IOException {
-        _out.flush();
+        if (!closed) {
+            _out.flush();
+        }
     }
 
     @Override
@@ -78,7 +81,10 @@ public class StreamingSheetWriter extends SheetDataWriter {
 
     @Override
     boolean dispose() throws IOException {
-        _out.close();
+        if (!closed) {
+            _out.close();
+        }
+        closed = true;
         return true;
     }
 }