Profile: avoid potential crash

If things go as planned, then the length of the polygon is the same as the
number of rows in the model. Turns out when running Subsurface-mobile on
Android that simple truth doesn't seem to be correct. Most of the time
the polygon seems to have twice as many elements as the model. But a few
times I ended up in here with a polygon that had fewer elements than the
model. And then things crash.

This simply avoids the crash.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/profile-widget/diveprofileitem.cpp b/profile-widget/diveprofileitem.cpp
index ca87f4ed0..849a9d3de 100644
--- a/profile-widget/diveprofileitem.cpp
+++ b/profile-widget/diveprofileitem.cpp
@@ -135,7 +135,8 @@ void DiveProfileItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *o
 		QModelIndex colorIndex = dataModel->index(i, DivePlotDataModel::COLOR);
 		pen.setBrush(QBrush(colorIndex.data(Qt::BackgroundRole).value<QColor>()));
 		painter->setPen(pen);
-		painter->drawLine(poly[i - 1], poly[i]);
+		if (i < poly.count())
+			painter->drawLine(poly[i - 1], poly[i]);
 	}
 	painter->restore();
 }