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-rw-r--r--src/gui/painting/qregion.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/gui/painting/qregion.cpp b/src/gui/painting/qregion.cpp
index 1e0ce30528..6ca87cb416 100644
--- a/src/gui/painting/qregion.cpp
+++ b/src/gui/painting/qregion.cpp
@@ -3569,6 +3569,7 @@ static QRegionPrivate *PolygonRegion(const QPoint *Pts, int Count, int rule)
int fixWAET = false;
POINTBLOCK FirstPtBlock, *curPtBlock; /* PtBlock buffers */
FirstPtBlock.pts = reinterpret_cast<QPoint *>(FirstPtBlock.data);
+ FirstPtBlock.next = nullptr;
POINTBLOCK *tmpPtBlock;
int numFullPtBlocks = 0;