From ac0969b9e90dcb9fcfc334adbd96e202ee5beca2 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 30 Jun 2021 07:41:45 +0530
Subject: [PATCH] Workaround for some element nodes not having dataset

---
 src/pyj/read_book/cfi.pyj | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pyj/read_book/cfi.pyj b/src/pyj/read_book/cfi.pyj
index 16089e1da4..f964ac8523 100644
--- a/src/pyj/read_book/cfi.pyj
+++ b/src/pyj/read_book/cfi.pyj
@@ -249,7 +249,7 @@ def node_at_index(nodes, target, index, iter_text_nodes):
     for i in range(nodes.length):
         node = nodes[i]
         is_element = node.nodeType is Node.ELEMENT_NODE
-        if is_element and node.dataset.calibreRangeWrapper:
+        if is_element and node.dataset?.calibreRangeWrapper:
             q, index = node_at_index(unwrapped_nodes(node), target, index, iter_text_nodes)
             if q:
                 return q, index