From cd22cb9739059edb89d16a0cb12abeb061fadef8 Mon Sep 17 00:00:00 2001
From: Melissa Linkert <melissa@glencoesoftware.com>
Date: Tue, 23 Jul 2024 16:36:39 -0500
Subject: [PATCH] DICOM writer: don't throw NPE if close was already called

Shouldn't affect bfconvert, but does affect ImageJ export which calls
close() twice.
---
 components/formats-bsd/src/loci/formats/out/DicomWriter.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/formats-bsd/src/loci/formats/out/DicomWriter.java b/components/formats-bsd/src/loci/formats/out/DicomWriter.java
index 23c6921f81a..4b26e2e8dc7 100644
--- a/components/formats-bsd/src/loci/formats/out/DicomWriter.java
+++ b/components/formats-bsd/src/loci/formats/out/DicomWriter.java
@@ -1383,6 +1383,11 @@ public void close() throws IOException {
         for (int res=0; res<resolutionCount; res++) {
           resolution = res;
           openFile(pyramid, resolution);
+
+          if (out == null) {
+            // already closed
+            continue;
+          }
           int resolutionIndex = getIndex(pyramid, resolution);
 
           out.seek(out.length());