diff --git a/check_opnsense_traffic_for_host.py b/check_opnsense_traffic_for_host.py
index cdc6e95..5a78ffa 100755
--- a/check_opnsense_traffic_for_host.py
+++ b/check_opnsense_traffic_for_host.py
@@ -81,14 +81,16 @@ def main():
 
         try:
             check_result[name] = {
-                    'rate_in': np.average([x['rate_bits_in'] for x in traffic_data]),
-                    'rate_out': np.average([x['rate_bits_out'] for x in traffic_data]),
-                    'cumulative_in': np.average([x['cumulative_bytes_in'] for x in traffic_data]),
-                    'cumulative_out': np.average([x['cumulative_bytes_out'] for x in traffic_data]),
-                    'connections': int(np.average([len(x['details']) for x in traffic_data]))
-                }
-        except:
-            print('Failed to parse traffic data.')
+                'rate_in': np.average([x['rate_bits_in'] for x in traffic_data]),
+                'rate_out': np.average([x['rate_bits_out'] for x in traffic_data]),
+                'cumulative_in': np.average([x['cumulative_bytes_in'] for x in traffic_data]),
+                'cumulative_out': np.average([x['cumulative_bytes_out'] for x in traffic_data]),
+                'connections': int(np.average([len(x['details']) for x in traffic_data]))
+            }
+        except Exception as e:
+            print(f'UNKNOWN: Failed to parse traffic data: "{e}"')
+            print(traceback.format_exc())
+            print('\nRaw data:')
             print(traffic_data)
             sys.exit(nagios.UNKNOWN)