spline: fix division by zero

1 files changed, 1 insertions, 1 deletions

diff --git a/spline/spline.cpp b/spline/spline.cpp
index d6bdf2c1..92e03ade 100644
--- a/spline/spline.cpp
+++ b/spline/spline.cpp
@@ -165,7 +165,7 @@ void spline::update_interp_data() const
         const QPointF& pt = list[0];
         const double x = pt.x();
         const double y = pt.y();
-        const unsigned max = std::clamp((unsigned)iround(x * c), 0u, value_count-1);
+        const unsigned max = std::clamp((unsigned)iround(x * c), 1u, value_count-1);
 
         for (unsigned k = 0; k <= max; k++)
             data[k] = float(y * k / max); // no need for bresenham