diff --git a/nspanel_esphome_addon_upload_tft.yaml b/nspanel_esphome_addon_upload_tft.yaml
index 5c92fd8..8e2162d 100644
--- a/nspanel_esphome_addon_upload_tft.yaml
+++ b/nspanel_esphome_addon_upload_tft.yaml
@@ -443,21 +443,21 @@ script:
           auto upload_range_esp_idf_ = [&](const std::string &url, int range_start) -> int {
               static const char *const TAG = "script.upload_tft.upload_range_esp_idf_";
               ESP_LOGVV(TAG, "url: %s", url.c_str());
-              ESP_LOGVV(TAG, "range_start: %i", range_start);
-              uint range_size_ = tft_size_ - range_start;
-              ESP_LOGVV(TAG, "range_size_: %i", range_size_);
-              if (range_size_ <= 0) {
+              uint range_size_ = this->tft_size_ - range_start;
+              ESP_LOGVV(TAG, "tft_size_: %i", this->tft_size_);
+              ESP_LOGV(TAG, "Available heap: %u", esp_get_free_heap_size());
+              int range_end = (range_start == 0) ? std::min(this->tft_size_, 16383) : this->tft_size_;
+              if (range_size_ <= 0 or range_end <= range_start) {
                 ESP_LOGE(TAG, "Invalid range");
+                ESP_LOGD(TAG, "Range start: %i", range_start);
+                ESP_LOGD(TAG, "Range end: %i", range_end);
+                ESP_LOGD(TAG, "Range size: %i", range_size_);
                 return -1;
               }
-              ESP_LOGVV(TAG, "tft_size_: %i", tft_size_);
-              ESP_LOGV(TAG, "Available heap: %u", esp_get_free_heap_size());
-
-              int range_end = (range_start == 0) ? std::min(tft_size_, 16383) : tft_size_;
-              ESP_LOGVV(TAG, "range_end: %i", range_end);
 
               esp_http_client_config_t config = {
                   .url = url.c_str(),
+                  .cert_pem = nullptr,
               };
               esp_http_client_handle_t client = esp_http_client_init(&config);
 
@@ -473,9 +473,16 @@ script:
                   esp_http_client_cleanup(client);
                   return -1;
               }
+
               ESP_LOGV(TAG, "Fetch content length");
               int content_length = esp_http_client_fetch_headers(client);
               ESP_LOGV(TAG, "content_length = %d", content_length);
+              if (content_length <= 0) {
+                ESP_LOGE(TAG, "Failed to get content length: %d", content_length);
+                esp_http_client_cleanup(client);
+                return -1;
+              }
+
               int total_read_len = 0, read_len;
 
               ESP_LOGV(TAG, "Allocate buffer");
@@ -565,6 +572,7 @@ script:
               ESP_LOGVV(TAG, "Available heap: %u", esp_get_free_heap_size());
               esp_http_client_config_t config = {
                   .url = url.c_str(),
+                  .cert_pem = nullptr,
                   .method = HTTP_METHOD_HEAD,
                   .timeout_ms = 15000,
               };