From 8e9528b365be760f7ffd82c53e6992f2a21b3cd6 Mon Sep 17 00:00:00 2001
From: Brian Reynolds <brian@brianreynolds.net>
Date: Tue, 12 Sep 2023 15:51:29 -0400
Subject: [PATCH] Don't divide by zero

---
 .../build/module/map/boardPicker/board/mapgrid/Zone.java      | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vassal-app/src/main/java/VASSAL/build/module/map/boardPicker/board/mapgrid/Zone.java b/vassal-app/src/main/java/VASSAL/build/module/map/boardPicker/board/mapgrid/Zone.java
index fb706c4ca1..5eddc882c9 100644
--- a/vassal-app/src/main/java/VASSAL/build/module/map/boardPicker/board/mapgrid/Zone.java
+++ b/vassal-app/src/main/java/VASSAL/build/module/map/boardPicker/board/mapgrid/Zone.java
@@ -361,6 +361,10 @@ else if (token.equals(GRID_LOCATION) && getGrid() != null) {
       // no grid to match against
       // try the geographic mean
       p = new Point(0, 0);
+      if (myPolygon.npoints <= 0) {
+        return p;
+      }
+
       for (int i = 0; i < myPolygon.npoints; ++i) {
         p.translate(myPolygon.xpoints[i], myPolygon.ypoints[i]);
       }