diff --git a/module.json b/module.json
index 1c38080..749ea45 100644
--- a/module.json
+++ b/module.json
@@ -2,7 +2,7 @@
 	"name": "terrain-height-tools",
 	"title": "Terrain Height Tools",
 	"description": "Tools for painting grid cells with terrain heights and calculating line of sight with respect to these heights.",
-	"version": "0.4.5",
+	"version": "0.4.6",
 	"compatibility": {
 		"minimum": "11",
 		"verified": "11",
diff --git a/module/utils/height-map-migrations.mjs b/module/utils/height-map-migrations.mjs
index ebfcb26..a005105 100644
--- a/module/utils/height-map-migrations.mjs
+++ b/module/utils/height-map-migrations.mjs
@@ -53,7 +53,7 @@ const migrations = [
 export function migrateData(data, targetVersion = DATA_VERSION) {
 	// If there is no data, return a blank V1 map
 	if (!data) {
-		return { v: 1, data: {} };
+		return { v: 2, data: [] };
 	}
 
 	// Try to get the `v` value from the data. If there is no `v` value, then treat it as v0. Then, sequentially apply
diff --git a/test/utils/height-map-migrations.test.mjs b/test/utils/height-map-migrations.test.mjs
index def9bae..a9d65dd 100644
--- a/test/utils/height-map-migrations.test.mjs
+++ b/test/utils/height-map-migrations.test.mjs
@@ -240,11 +240,11 @@ describe("migrateData()", () => {
 
 	it("should correctly initialise a blank HeightMapDataV1 when given undefined", () => {
 		const blank = migrateData(undefined);
-		assert.deepEqual(blank, { v: 1, data: {} });
+		assert.deepEqual(blank, { v: 2, data: [] });
 	});
 
 	it("should correctly initialise a blank HeightMapDataV1 when given null", () => {
 		const blank = migrateData(null);
-		assert.deepEqual(blank, { v: 1, data: {} });
+		assert.deepEqual(blank, { v: 2, data: [] });
 	});
 });