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-rw-r--r--libqpdf/QPDFPageLabelDocumentHelper.cc4
1 files changed, 2 insertions, 2 deletions
diff --git a/libqpdf/QPDFPageLabelDocumentHelper.cc b/libqpdf/QPDFPageLabelDocumentHelper.cc
index 63be5809..a650fa9c 100644
--- a/libqpdf/QPDFPageLabelDocumentHelper.cc
+++ b/libqpdf/QPDFPageLabelDocumentHelper.cc
@@ -85,8 +85,8 @@ QPDFPageLabelDocumentHelper::getLabelsForPageRange(
bool skip_first = false;
if (size >= 2)
{
- QPDFObjectHandle last = new_labels[size - 1];
- QPDFObjectHandle last_idx = new_labels[size - 2];
+ QPDFObjectHandle last = new_labels.at(size - 1);
+ QPDFObjectHandle last_idx = new_labels.at(size - 2);
if (last_idx.isInteger() && last.isDictionary() &&
(label.getKey("/S").unparse() == last.getKey("/S").unparse()) &&
(label.getKey("/P").unparse() == last.getKey("/P").unparse()) &&