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commit b195a3b9ed72f646c0efb34e0637467aa9913e46
Author: Dominik Stadler <[email protected]>
AuthorDate: Tue Jan 6 20:40:17 2026 +0100

    Avoid an NPE when OPCPackage is closed without being fully initialized
---
 .../java/org/apache/poi/openxml4j/opc/OPCPackage.java     |  5 ++++-
 .../java/org/apache/poi/openxml4j/TestOPCPackage.java     | 15 +++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git 
a/poi-ooxml/src/main/java/org/apache/poi/openxml4j/opc/OPCPackage.java 
b/poi-ooxml/src/main/java/org/apache/poi/openxml4j/opc/OPCPackage.java
index afdb5a5800..fcb774d4f7 100644
--- a/poi-ooxml/src/main/java/org/apache/poi/openxml4j/opc/OPCPackage.java
+++ b/poi-ooxml/src/main/java/org/apache/poi/openxml4j/opc/OPCPackage.java
@@ -1875,7 +1875,10 @@ public abstract class OPCPackage implements 
RelationshipSource, Closeable {
     public abstract boolean isClosed();
 
     protected void closeParts() {
-        partList.closeParts();
+        // might not be initialized fully yet
+        if (partList != null) {
+            partList.closeParts();
+        }
     }
 
     @Override
diff --git 
a/poi-ooxml/src/test/java/org/apache/poi/openxml4j/TestOPCPackage.java 
b/poi-ooxml/src/test/java/org/apache/poi/openxml4j/TestOPCPackage.java
index 3a2d9bdcd3..30d2a2bf15 100644
--- a/poi-ooxml/src/test/java/org/apache/poi/openxml4j/TestOPCPackage.java
+++ b/poi-ooxml/src/test/java/org/apache/poi/openxml4j/TestOPCPackage.java
@@ -19,12 +19,21 @@ package org.apache.poi.openxml4j;
 
 import org.apache.poi.hssf.HSSFTestDataSamples;
 import org.apache.poi.ooxml.TrackingInputStream;
+import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
 import org.apache.poi.openxml4j.opc.OPCPackage;
+import org.apache.poi.openxml4j.opc.PackageAccess;
+import org.apache.poi.openxml4j.opc.PackagePart;
+import org.apache.poi.openxml4j.opc.PackagePartCollection;
+import org.apache.poi.openxml4j.opc.PackagePartName;
+import org.apache.poi.openxml4j.opc.ZipPackage;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.IOException;
+import java.io.OutputStream;
+
 class TestOPCPackage {
     @Test
     void testPackageCloseClosesInputStream() throws Exception {
@@ -48,4 +57,10 @@ class TestOPCPackage {
         }
     }
 
+    @Test
+    void testCloseWithEmptyList() throws IOException {
+        OPCPackage pkg = new ZipPackage();
+
+        pkg.close();
+    }
 }


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