From 4f36b876530d02308d7051eea3065a631c677918 Mon Sep 17 00:00:00 2001
From: jhendersonHDF <jhenderson@hdfgroup.org>
Date: Mon, 13 Dec 2021 06:56:54 -0600
Subject: Initialize filter mask and chunk nbytes for 'Single' chunk index
 (#1261) (#1275)

---
 src/H5Dsingle.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/H5Dsingle.c b/src/H5Dsingle.c
index 50cf6a1..b93523a 100644
--- a/src/H5Dsingle.c
+++ b/src/H5Dsingle.c
@@ -125,8 +125,14 @@ H5D__single_idx_init(const H5D_chk_idx_info_t *idx_info, const H5S_t H5_ATTR_UNU
     HDassert(idx_info->layout);
     HDassert(idx_info->storage);
 
-    if (idx_info->pline->nused)
+    if (idx_info->pline->nused) {
         idx_info->layout->flags |= H5O_LAYOUT_CHUNK_SINGLE_INDEX_WITH_FILTER;
+
+        if (!H5F_addr_defined(idx_info->storage->idx_addr)) {
+            idx_info->storage->u.single.nbytes      = 0;
+            idx_info->storage->u.single.filter_mask = 0;
+        }
+    }
     else
         idx_info->layout->flags = 0;
 
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