diff --git a/src/integrations/home-assistant/home-assistant.service.spec.ts b/src/integrations/home-assistant/home-assistant.service.spec.ts
index 89492dc..8fbcfa8 100644
--- a/src/integrations/home-assistant/home-assistant.service.spec.ts
+++ b/src/integrations/home-assistant/home-assistant.service.spec.ts
@@ -924,6 +924,32 @@ describe('HomeAssistantService', () => {
       expect(mockMqttClient.publish).toHaveBeenCalledTimes(1);
     });
 
+    it('should format string array attribute updates correctly', async () => {
+      jest.useFakeTimers();
+      await service.onModuleInit();
+      const sensor = new Sensor('test', 'Test');
+      service.handleNewEntity(sensor);
+
+      sensor.attributes.nodes = ['abc', 'def'];
+      service.handleEntityUpdate(
+        sensor,
+        [
+          {
+            newValue: ['abc', 'def'],
+            oldValue: undefined,
+            path: '/attributes/nodes',
+          },
+        ],
+        true
+      );
+      jest.runAllTimers();
+
+      expect(mockMqttClient.publish).toHaveBeenCalledWith(
+        'room-assistant/sensor/test-instance-test/attributes',
+        JSON.stringify({ nodes: ['abc', 'def'] })
+      );
+    });
+
     it('should not publish attribute updates if sendAttributes is disabled', async () => {
       jest.useFakeTimers();
       mockConfig.sendAttributes = false;
diff --git a/src/integrations/home-assistant/home-assistant.service.ts b/src/integrations/home-assistant/home-assistant.service.ts
index 62431bf..8fae92b 100644
--- a/src/integrations/home-assistant/home-assistant.service.ts
+++ b/src/integrations/home-assistant/home-assistant.service.ts
@@ -584,6 +584,10 @@ export class HomeAssistantService
    * @param mapper - Function to apply to all items
    */
   private deepMap(obj: object, mapper: (v: object) => object): object {
+    if (!_.isObject(obj)) {
+      return mapper(obj);
+    }
+
     const mappingMethod: (
       obj: object,
       callback: (v: object) => object