diff --git a/firmware/esp32-csi-node/main/display_task.c b/firmware/esp32-csi-node/main/display_task.c
index 85a04b883..9d834edc5 100644
--- a/firmware/esp32-csi-node/main/display_task.c
+++ b/firmware/esp32-csi-node/main/display_task.c
@@ -118,8 +118,14 @@ esp_err_t display_task_start(void)
     if (!buf1 || !buf2) {
         ESP_LOGE(TAG, "Failed to allocate LVGL buffers (%u bytes, caps=0x%lx)",
                  (unsigned)buf_size, (unsigned long)alloc_caps);
-        if (buf1) free(buf1);
-        if (buf2) free(buf2);
+        if (buf1) {
+            free(buf1);
+            buf1 = NULL;
+        }
+        if (buf2) {
+            free(buf2);
+            buf2 = NULL;
+        }
         return ESP_OK;
     }
     ESP_LOGI(TAG, "LVGL buffers: 2x %u bytes (%u lines, %s)",