diff --git a/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java b/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
index ded4c760..4b8f9cd3 100644
--- a/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
+++ b/backend/src/main/java/org/raddatz/familienarchiv/controller/OcrController.java
@@ -81,6 +81,7 @@ public class OcrController {
             AppUser user = userService.findByUsername(authentication.getName());
             return user != null ? user.getId() : null;
         } catch (Exception e) {
+            log.warn("Failed to resolve user ID for authentication: {}", authentication.getName(), e);
             return null;
         }
     }