diff --git a/litellm/llms/sap/credentials.py b/litellm/llms/sap/credentials.py
index 474b3efeff9..eb5341c7927 100644
--- a/litellm/llms/sap/credentials.py
+++ b/litellm/llms/sap/credentials.py
@@ -62,7 +62,7 @@ def _load_json_env(var_name: str) -> Optional[Dict[str, Any]]:
         return None
 
 def _str_or_none(value) -> Optional[str]:
-    return str(value) if value else None
+    return str(value) if value is not None else None
 
 
 def _load_vcap() -> Dict[str, Any]:
diff --git a/tests/test_litellm/llms/sap/test_sap_fetch_creds.py b/tests/test_litellm/llms/sap/test_sap_fetch_creds.py
index c40ef5e8025..698bb819d3a 100644
--- a/tests/test_litellm/llms/sap/test_sap_fetch_creds.py
+++ b/tests/test_litellm/llms/sap/test_sap_fetch_creds.py
@@ -41,12 +41,14 @@ def test_sap_fetch_creds_from_env_service_key(monkeypatch):
 
 def test_sap_fetch_creds_from_arg_service_key(monkeypatch):
     monkeypatch.setattr(sap_credentials, "sap_service_key", None)
+    monkeypatch.delenv("AICORE_SERVICE_KEY", raising=False)
     monkeypatch.setenv("AICORE_HOME", 'notexist')
     creds = sap_credentials.fetch_credentials(service_key=json.dumps(mock_sap_service_key_dict))
     assert creds == expected_creds
 
 def test_fetch_creds_from_env_vcap_service(monkeypatch):
     monkeypatch.setattr(sap_credentials, "sap_service_key", None)
+    monkeypatch.delenv("AICORE_SERVICE_KEY", raising=False)
     monkeypatch.setenv("AICORE_HOME", 'notexist')
     monkeypatch.setenv("VCAP_SERVICES", json.dumps(mock_sap_vcap_service_key_dict))
     creds = sap_credentials.fetch_credentials()
@@ -55,6 +57,8 @@ def test_fetch_creds_from_env_vcap_service(monkeypatch):
 
 def test_fetch_creds_from_env(monkeypatch):
     monkeypatch.setattr(sap_credentials, "sap_service_key", None)
+    monkeypatch.delenv("AICORE_SERVICE_KEY", raising=False)
+    monkeypatch.delenv("VCAP_SERVICES", raising=False)
     monkeypatch.setenv("AICORE_HOME", 'notexist')
     monkeypatch.setenv("AICORE_CLIENT_ID", "env-client-id")
     monkeypatch.setenv("AICORE_CLIENT_SECRET", "env-client-secret")
@@ -72,6 +76,7 @@ def test_fetch_creds_from_env(monkeypatch):
 
 def test_creds_priority_order(monkeypatch):
     monkeypatch.setattr(sap_credentials, "sap_service_key", None)
+    monkeypatch.delenv("AICORE_SERVICE_KEY", raising=False)
     monkeypatch.setenv("AICORE_HOME", 'notexist')
     monkeypatch.setenv("AICORE_CLIENT_ID", "env-client-id")
     monkeypatch.setenv("AICORE_CLIENT_SECRET", "env-client-secret")