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https://issues.apache.org/jira/browse/FOP-2292?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13751166#comment-13751166
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Vincent Hennebert commented on FOP-2292:
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The error seems to indicate a bug in FOP, I don't think the font is at cause. 
The slightly different metrics to Arial might be enough for the bug to show up 
with Helvetica and not Arial. That's why it would be good if it could be 
reproduced with Helvetica, so that it can be investigated.
                
> [PATCH] NullPointerException after page IPD change
> --------------------------------------------------
>
>                 Key: FOP-2292
>                 URL: https://issues.apache.org/jira/browse/FOP-2292
>             Project: Fop
>          Issue Type: Bug
>          Components: general
>    Affects Versions: 1.0
>            Reporter: Seifeddine Dridi
>             Fix For: 1.1
>
>         Attachments: expected.pdf, fop.pdf, idea.patch, test.fo
>
>
> The error occurs when FOP detects an IPD change and redoes phase 1 of the 
> layout process. A NullPointerException is fired in 
> getNextBlockListChangedIPD() at line 820, it seems that getPosition() is 
> returning null.
> Can anyone confirm this issue?

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