[Koha-bugs] [Bug 21092] New: Bad template in patron card creator can cause server issues

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21092

            Bug ID: 21092
           Summary: Bad template in patron card creator can cause server
                    issues
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Label/patron card printing
          Assignee: cnighswonger at foundations.edu
          Reporter: katrin.fischer at bsz-bw.de
        QA Contact: testopia at bugs.koha-community.org

While creating the PDF file for a patron card batch the CPU goes to 100% and
brings the server down.

We have seen this behaviour in 2 separate package installations running
17.11.07 so far. We have sadly not been able to make it happen in a dev
environment. 

Filing the report in hope that someone has an idea or seen something similar
that will help us to nail down the problem.

So far we think the problem is related to 0 values in a patron card template. 

I will attach screenshots of the layout and patron card template used, when the
problem appears.

To test:
- Add patron card template
- Add patron card layout (or use existing)
- Create batch of patrons
- Export
- Click on PDF link
- Boom! There is no error, the system just keeps loading.

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