Cavegen: fix division by 0 with abnormal max tunnel diameter sizes

diff --git a/src/cavegen.cpp b/src/cavegen.cpp
index 01543252a718c99ba9bd4f30c9b2355779ad912f..8e6798586b38edc802502b55f5b79a0ed1a46fbd 100644 (file)
--- a/src/cavegen.cpp
+++ b/src/cavegen.cpp
@@ -70,7 +70,7 @@ void CaveV6::makeCave(v3s16 nmin, v3s16 nmax, int max_stone_height) {
        //(this should be more than the maximum radius of the tunnel)
        const s16 max_spread_amount = MAP_BLOCKSIZE;
        s16 insure = 10;
-       s16 more = max_spread_amount - max_tunnel_diameter / 2 - insure;
+       s16 more = MYMAX(max_spread_amount - max_tunnel_diameter / 2 - insure, 1);
        ar += v3s16(1,0,1) * more * 2;
        of -= v3s16(1,0,1) * more;