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Fixup c7496a11: test emptiness before accessing elements

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This commit is contained in:
Jean-Marc Lasgouttes 2018-06-01 21:48:26 +02:00
parent 2fbce44401
commit 4d0c43f9aa
1 changed files with 3 additions and 1 deletions
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4
src/Undo.cpp
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@ -612,7 +612,9 @@ void Undo::endUndoGroup(CursorData const & cur_after)
bool Undo::activeUndoGroup() const
{
return d->group_level_ > 0 && d->undostack_.top().group_id == d->group_id_;
return d->group_level_ > 0
&& !d->undostack_.empty()
&& d->undostack_.top().group_id == d->group_id_;
}