diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7cd0c84f..122829877 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 **Fixes**:
 
 - Remove spurious decref in `sentry_capture_user_feedback()` ([#1510](https://github.com/getsentry/sentry-native/pull/1510))
+- Prevent double-decref of event in envelope add functions ([#1511](https://github.com/getsentry/sentry-native/pull/1511))
 
 ## 0.12.6
 
diff --git a/src/sentry_envelope.c b/src/sentry_envelope.c
index fc81cea24..3e8225284 100644
--- a/src/sentry_envelope.c
+++ b/src/sentry_envelope.c
@@ -296,12 +296,12 @@ sentry__envelope_add_event(sentry_envelope_t *envelope, sentry_value_t event)
     sentry_uuid_t event_id;
     sentry__ensure_event_id(event, &event_id);
 
-    item->event = event;
     sentry__jsonwriter_write_value(jw, event);
     item->payload = sentry__jsonwriter_into_string(jw, &item->payload_len);
     if (!item->payload) {
         return NULL;
     }
+    item->event = event;
 
     sentry__envelope_item_set_header(
         item, "type", sentry_value_new_string("event"));
@@ -381,12 +381,12 @@ sentry__envelope_add_transaction(
     sentry_uuid_t event_id;
     sentry__ensure_event_id(transaction, &event_id);
 
-    item->event = transaction;
     sentry__jsonwriter_write_value(jw, transaction);
     item->payload = sentry__jsonwriter_into_string(jw, &item->payload_len);
     if (!item->payload) {
         return NULL;
     }
+    item->event = transaction;
 
     sentry__envelope_item_set_header(
         item, "type", sentry_value_new_string("transaction"));