Error when you run document merge on SOME persons shown in a report

[tbar0970]

View a report
Tick SOME of the persons but not all
Mail merge a document

Undefined offset: 7 
Line 254 of /home/jethro/code/2.34.1/app/calls/call_document_merge.class.php
USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

It seems like the code is making the assumption that all persons in the report will be part of the merge

[tim-pearce]

My version, which has that same code does not get that error.

[tim-pearce]

I don't have a running copy of version 2.34.1.
I can only assume that line 248,249 is returning data for all persons.
In that case replace
$merge_data[$val] += $data;
with
if (isset($merge_data[$val])) {
$merge_data[$val] += $data;
}