diff --git a/CHANGELOG.md b/CHANGELOG.md
index 88c093e041..40435d6650 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -677,6 +677,10 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Fixed an issue with `pl.utilities.seed.reset_seed` converting the `PL_SEED_WORKERS` environment variable to `bool` ([#10099](https://github.com/PyTorchLightning/pytorch-lightning/pull/10099))
 
 
+- Fixed iterating over a logger collection when `fast_dev_run > 0` ([#10232](https://github.com/PyTorchLightning/pytorch-lightning/pull/10232))
+
+
+
 ## [1.4.9] - 2021-09-30
 
 - Fixed `lr_find` to generate same results on multiple calls ([#9704](https://github.com/PyTorchLightning/pytorch-lightning/pull/9704))
diff --git a/pytorch_lightning/loggers/base.py b/pytorch_lightning/loggers/base.py
index 35b266dfc4..e5ccae435d 100644
--- a/pytorch_lightning/loggers/base.py
+++ b/pytorch_lightning/loggers/base.py
@@ -510,6 +510,10 @@ class DummyLogger(LightningLoggerBase):
         # enables self.logger[0].experiment.add_image(...)
         return self
 
+    def __iter__(self):
+        # if DummyLogger is substituting a logger collection, pretend it is empty
+        yield from ()
+
 
 def merge_dicts(
     dicts: Sequence[Mapping],
diff --git a/tests/loggers/test_base.py b/tests/loggers/test_base.py
index 7b02d6d72b..d6b753c043 100644
--- a/tests/loggers/test_base.py
+++ b/tests/loggers/test_base.py
@@ -227,6 +227,13 @@ def test_dummylogger_support_indexing():
     assert logger[0] == logger
 
 
+def test_dummylogger_empty_iterable():
+    """Test that DummyLogger represents an empty iterable."""
+    logger = DummyLogger()
+    for _ in logger:
+        assert False
+
+
 def test_dummylogger_noop_method_calls():
     """Test that the DummyLogger methods can be called with arbitrary arguments."""
     logger = DummyLogger()