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--- a/src/cairo-pen.c 2022-03-30 09:48:14.702456922 +0100
+++ b/src/cairo-pen.c 2022-03-30 09:50:40.011793460 +0100
@@ -289,7 +289,12 @@
} else if (tolerance >= major_axis) {
num_vertices = 4;
} else {
- num_vertices = ceil (2*M_PI / acos (1 - tolerance / major_axis));
+ double divisor = acos (1 - tolerance / major_axis);
+
+ if (divisor == 0.0)
+ return 4;
+
+ num_vertices = ceil (2*M_PI / divisor);
/* number of vertices must be even */
if (num_vertices % 2)
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