Ported fix from OpenSRProject/OpenStarRuler-Modpack@30fdf63.

Author: DaloLorn

Rising Stars/scripts/definitions/ABEM_version.as

@@ -2,7 +2,7 @@ import version;
 import CP_version;
 
 // ABEMMOD's last revision was 724.
-const string MOD_REVISION = "1414";
+const string MOD_REVISION = "1415";
 const array<string> VERSIONS = {
 	"v2.0.3",
 	"OpenSR v1.0.0",
@@ -22,6 +22,7 @@ const array<string> CP_VERSIONS = {
 const array<string> CP_REVISIONS = {
 	"295",
 	"296",
+	"297",
 };
 
 const string MOD_NAME = "Rising Stars v1.4.0";

Rising Stars/scripts/server/planets/SurfaceGrid.as

@@ -1243,14 +1243,21 @@ tidy class SurfaceGrid : PlanetSurface {
 		}
 	}
 
-	void addSurfaceArea(const vec2i& addSize, array<uint8>& addBiomes, uint8 voidBiome = uint(-1), bool developed = false, bool vertical = false, const array<bool>@ devState = null) {
+	void addSurfaceArea(const vec2i& addedSize, array<uint8>& addBiomes, uint8 voidBiome = uint(-1), bool developed = false, bool vertical = false, const array<bool>@ devState = null) {
+		// Can't change the signature without potentially breaking downstream 
+		// mods depending on this function, but this is not legal.
+		// It was never legal.
+		if(addedSize.width < 0 || addedSize.height < 0)
+			return;
+
 		array<uint8> oldBiomes = biomes;
 		array<uint8> oldFlags = flags;
 		array<SurfaceBuilding@> oldBuildings = tileBuildings;
 		vec2u oldSize = size;
 		if(voidBiome == uint(-1))
 			voidBiome = baseBiome.id;
 		delta = true;
+		vec2u addSize = vec2u(uint(addedSize.width), uint(addedSize.height));
 
 		if(vertical) {
 			size.y += addSize.y;