diff --git a/src/fellchensammlung/animal_shelter.py b/src/fellchensammlung/animal_shelter.py
index 9fa1357..ad9ab5a 100644
--- a/src/fellchensammlung/animal_shelter.py
+++ b/src/fellchensammlung/animal_shelter.py
@@ -42,6 +42,8 @@ def send_to_api(data):
         print(f"Error: Shelter '{data['name']}' already exists or invalid data.")
     else:
         print(f"Unexpected Error: {response.status_code} - {response.text}")
+        raise ConnectionError
+
 
 def main():
     # Step 1: Load OSM data