diff --git a/fedn/network/combiner/aggregators/aggregatorbase.py b/fedn/network/combiner/aggregators/aggregatorbase.py
index f6931645a..44d10fca2 100644
--- a/fedn/network/combiner/aggregators/aggregatorbase.py
+++ b/fedn/network/combiner/aggregators/aggregatorbase.py
@@ -1,6 +1,7 @@
 import importlib
 import json
 import queue
+import traceback
 from abc import ABC, abstractmethod
 
 from fedn.common.log_config import logger
@@ -9,7 +10,7 @@
 
 
 class AggregatorBase(ABC):
-    """ Abstract class defining an aggregator.
+    """Abstract class defining an aggregator.
 
     :param id: A reference to id of :class: `fedn.network.combiner.Combiner`
     :type id: str
@@ -25,7 +26,7 @@ class AggregatorBase(ABC):
 
     @abstractmethod
     def __init__(self, storage, server, modelservice, round_handler):
-        """ Initialize the aggregator."""
+        """Initialize the aggregator."""
         self.name = self.__class__.__name__
         self.storage = storage
         self.server = server
@@ -75,11 +76,13 @@ def on_model_update(self, model_update):
             else:
                 logger.warning("AGGREGATOR({}): Invalid model update, skipping.".format(self.name))
         except Exception as e:
-            logger.error("AGGREGATOR({}): failed to receive model update! {}".format(self.name, e))
+            tb = traceback.format_exc()
+            logger.error("AGGREGATOR({}): failed to receive model update: {}".format(self.name, e))
+            logger.error(tb)
             pass
 
     def _validate_model_update(self, model_update):
-        """ Validate the model update.
+        """Validate the model update.
 
         :param model_update: A ModelUpdate message.
         :type model_update: object
@@ -88,14 +91,16 @@ def _validate_model_update(self, model_update):
         """
         try:
             data = json.loads(model_update.meta)["training_metadata"]
-            num_examples = data["num_examples"]
-        except KeyError as e:
+            _ = data["num_examples"]
+        except KeyError:
+            tb = traceback.format_exc()
             logger.error("AGGREGATOR({}): Invalid model update, missing metadata.".format(self.name))
+            logger.error(tb)
             return False
         return True
 
     def next_model_update(self):
-        """ Get the next model update from the queue.
+        """Get the next model update from the queue.
 
         :param helper: A helper object.
         :type helper: object
@@ -106,7 +111,7 @@ def next_model_update(self):
         return model_update
 
     def load_model_update(self, model_update, helper):
-        """ Load the memory representation of the model update.
+        """Load the memory representation of the model update.
 
         Load the model update paramters and the
         associate metadata into memory.
@@ -134,15 +139,13 @@ def load_model_update(self, model_update, helper):
         return model, training_metadata
 
     def get_state(self):
-        """ Get the state of the aggregator's queue, including the number of model updates."""
-        state = {
-            "queue_len": self.model_updates.qsize()
-        }
+        """Get the state of the aggregator's queue, including the number of model updates."""
+        state = {"queue_len": self.model_updates.qsize()}
         return state
 
 
 def get_aggregator(aggregator_module_name, storage, server, modelservice, control):
-    """ Return an instance of the helper class.
+    """Return an instance of the helper class.
 
     :param helper_module_name: The name of the helper plugin module.
     :type helper_module_name: str