https://bz.apache.org/bugzilla/show_bug.cgi?id=58315

            Bug ID: 58315
           Summary: NullPointerException by
                    XSSFRichTextString.getFontAtIndex
           Product: POI
           Version: 3.12-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSSF
          Assignee: dev@poi.apache.org
          Reporter: florian.linderma...@lfst.bayern.de

Created attachment 33058
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=33058&action=edit
Sample Project To Show the bug

Hello,

i need to find striked out Characters in a Cell. In my Cell is a String
containing "320 338 350". " 388" is striked out and has a blue color.

My code breaks when trying to retriev the Font(richText.getFontAtIndex(i)) with
i==2. At i==2 the Font changes from a the rich text font(getFontAtIndex is
returning a Font) to the cell font(getFontAtIndex should return null).

for (int i = richText.length() - 1; i >= 0; i--) {
    Font f = richText.getFontAtIndex(i);
    if (f != null && f.getStrikeout()) {
        tmpCellContent.deleteCharAt(i);
    }
}

I attached a sample project. Run the unit test

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