diff --git a/bigstuff.cpp b/bigstuff.cpp
index fc820c80..10d0dc98 100644
--- a/bigstuff.cpp
+++ b/bigstuff.cpp
@@ -32,6 +32,7 @@ int getAnthraxData(cell *c, bool b) {
 int roundTableRadius(cell *c) {
   if(eubinary) return 28;
   if(tactic::on) return getAnthraxData(c, true);
+  if(!c->master->alt) return 28;
   return c->master->alt->alt->emeraldval & GRAIL_RADIUS_MASK;
   }