diff --git a/pytorch_lightning/loggers/base.py b/pytorch_lightning/loggers/base.py
index cf0b22d7d446f..2246d02bc9bcb 100644
--- a/pytorch_lightning/loggers/base.py
+++ b/pytorch_lightning/loggers/base.py
@@ -188,7 +188,7 @@ def _sanitize_callable(val):
                         return val.__name__
                     return _val
                 except Exception:
-                    return val.__name__
+                    return getattr(val, "__name__", None)
             return val
 
         return {key: _sanitize_callable(val) for key, val in params.items()}
diff --git a/tests/loggers/test_wandb.py b/tests/loggers/test_wandb.py
index cfb6533bd913b..a7fd986bad642 100644
--- a/tests/loggers/test_wandb.py
+++ b/tests/loggers/test_wandb.py
@@ -19,7 +19,7 @@
 
 from pytorch_lightning import Trainer
 from pytorch_lightning.loggers import WandbLogger
-from tests.base import EvalModelTemplate
+from tests.base import EvalModelTemplate, BoringModel
 
 
 @mock.patch('pytorch_lightning.loggers.wandb.wandb')
@@ -135,6 +135,8 @@ def return_something():
 
     def wrapper_something():
         return return_something
+
+    params.wrapper_something_wo_name = lambda: lambda: '1'
     params.wrapper_something = wrapper_something
 
     assert isinstance(params.gpus, types.FunctionType)
@@ -144,3 +146,4 @@ def wrapper_something():
     assert params["gpus"] == '_gpus_arg_default'
     assert params["something"] == "something"
     assert params["wrapper_something"] == "wrapper_something"
+    assert params["wrapper_something_wo_name"] == "<lambda>"