diff --git a/backend/app/routers/identify.py b/backend/app/routers/identify.py
index f668c93..89f0329 100644
--- a/backend/app/routers/identify.py
+++ b/backend/app/routers/identify.py
@@ -23,7 +23,8 @@ async def identify_plant(file: UploadFile = File(...)):
     else:
         source = "plantnet"
 
-    # 4. Mettre en cache
-    redis_cache.set(image_bytes, results)
+    # 4. Mettre en cache uniquement si des résultats ont été trouvés
+    if results:
+        redis_cache.set(image_bytes, results)
 
     return {"source": source, "results": results}
diff --git a/backend/app/services/plantnet.py b/backend/app/services/plantnet.py
index 1a3edf1..f9c6e31 100644
--- a/backend/app/services/plantnet.py
+++ b/backend/app/services/plantnet.py
@@ -3,7 +3,7 @@ from typing import List
 
 import httpx
 
-PLANTNET_KEY = os.environ.get("PLANTNET_API_KEY", "2b1088cHCJ4c7Cn2Vqq67xfve")
+PLANTNET_KEY = os.environ.get("PLANTNET_API_KEY", "")
 PLANTNET_URL = "https://my-api.plantnet.org/v2/identify/all"