From b1f86b90d58360d7200a46f5f025bc53bf059756 Mon Sep 17 00:00:00 2001
From: Daniele Verducci <danieleverducci@zenpenguin>
Date: Thu, 11 Dec 2025 23:38:01 +0100
Subject: [PATCH] Selecting folder by tag works, but invalid tags makes the
 device crash

---
 esphome/fabula.yaml | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/esphome/fabula.yaml b/esphome/fabula.yaml
index daab4ea..8c6dc53 100644
--- a/esphome/fabula.yaml
+++ b/esphome/fabula.yaml
@@ -42,16 +42,22 @@ pn532_i2c:
           loop: True
           # Crashes somewhere here in the lambda
           folder: !lambda |-
-            if (!tag.has_ndef_message()) {
-              return 0; // Plays "No tag found" audio
-            }
-            auto message = tag.get_ndef_message();
-            auto records = message->get_records();
-            for (auto &record : records) {
-              std::string payload = record->get_payload();
-              ESP_LOGD("Fabula", "NFC NDEF record type %s - value %s - int value %d", record->get_type().c_str(), record->get_payload().c_str(), stoi(payload));
-              return stoi(payload);
+            if (tag.has_ndef_message()) {
+              const auto &message = tag.get_ndef_message();
+              const auto &records = message->get_records();
+              for (const auto &record : records) {
+                if (record->get_type().c_str()[0] != 'T') {
+                  ESP_LOGD("Fabula", "  Ignoring non-text record %s", record->get_payload().c_str());
+                  continue;
+                }
+                ESP_LOGD("Fabula", "  Found record %s in tag, try to convert to int", record->get_payload().c_str());
+                // Note: exception handling is disabled in ESPHome: the following line may crash the microcontroller if a tag with a textual record if scanned
+                int folderId = std::stoi(record->get_payload());
+                ESP_LOGD("Fabula", "  Found valid record in tag: playing folder %d", folderId);
+                return folderId;
+              }
             }
+            ESP_LOGD("Fabula", "  No valid record found in tag. Please add a text field containing the folder number, e.g. 001");
             return 0;
   on_tag_removed: 
     then: