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-rw-r--r--src/ui/tools/flood-tool.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ui/tools/flood-tool.cpp b/src/ui/tools/flood-tool.cpp
index 82057f483..e4c4e855d 100644
--- a/src/ui/tools/flood-tool.cpp
+++ b/src/ui/tools/flood-tool.cpp
@@ -621,7 +621,7 @@ static ScanlineCheckResult perform_bitmap_scanline_check(std::deque<Geom::Point>
bool currently_painting_top = false;
bool currently_painting_bottom = false;
- unsigned int top_ty = bci.y - 1;
+ unsigned int top_ty = (bci.y > 0) ? bci.y - 1 : 0;
unsigned int bottom_ty = bci.y + 1;
bool can_paint_top = (top_ty > 0);