diff --git a/rug.cpp b/rug.cpp
index 5779050d..8161a604 100644
--- a/rug.cpp
+++ b/rug.cpp
@@ -1745,6 +1745,7 @@ hyperpoint gethyper(ld x, ld y) {
     auto r1 = triangles[i].m[1];
     auto r2 = triangles[i].m[2];
     if(!r2) continue;
+    if(!r0->valid || !r1->valid || !r2->valid) continue;
     hyperpoint p0, p1, p2;
     bool error = false;
     int spherepoints = 0;