Avoid NPE in HSSFShapeGroup.setShapeId()

poi/src/main/java/org/apache/poi/hssf/usermodel/HSSFShapeGroup.java

@@ -355,7 +355,11 @@ public class HSSFShapeGroup extends HSSFShape implements HSSFShapeContainer {
         EscherContainerRecord containerRecord = getEscherContainer().getChildById(EscherContainerRecord.SP_CONTAINER);
         EscherSpRecord spRecord = containerRecord.getChildById(EscherSpRecord.RECORD_ID);
         spRecord.setShapeId(shapeId);
-        CommonObjectDataSubRecord cod = (CommonObjectDataSubRecord) getObjRecord().getSubRecords().get(0);
+        ObjRecord objRecord = getObjRecord();
+        if (objRecord == null) {
+            throw new IllegalStateException("Did not have an ObjRecord for the HSSFShapeGroup");
+        }
+        CommonObjectDataSubRecord cod = (CommonObjectDataSubRecord) objRecord.getSubRecords().get(0);
         cod.setObjectId((short) (shapeId % 1024));
     }
 

poi/src/test/java/org/apache/poi/hssf/model/TestDrawingAggregate.java

@@ -139,7 +139,8 @@ class TestDrawingAggregate {
                         !file.getName().equals("clusterfuzz-testcase-minimized-POIHSSFFuzzer-5285517825277952.xls") &&
                         !file.getName().equals("clusterfuzz-testcase-minimized-POIHSSFFuzzer-4977868385681408.xls") &&
                         !file.getName().equals("crash-e329fca9087fe21bca4a80c8bc472a661c98d860.xls") &&
-                        !file.getName().equals("cf9f845e73447b092477d0472402a5baea4b8c9f.xls")).
+                        !file.getName().equals("cf9f845e73447b092477d0472402a5baea4b8c9f.xls") &&
+                        !file.getName().equals("LIBRE_OFFICE-94379-0.zip-57.xls")).
                 map(Arguments::of);
     }