diff --git a/src/con_duct/__main__.py b/src/con_duct/__main__.py
index a90e2b48..627cf923 100644
--- a/src/con_duct/__main__.py
+++ b/src/con_duct/__main__.py
@@ -343,8 +343,7 @@ def __init__(
         self.number = 1
         self.system_info: SystemInfo | None = None
         self.full_run_stats = Sample()
-        self.averages: Averages = Averages()
-        self.current_sample: Sample | None = None
+        self.current_sample: Optional[Sample] = None
         self.end_time: float | None = None
         self.run_time_seconds: str | None = None
 
@@ -461,6 +460,7 @@ def update_from_sample(self, sample: Sample) -> None:
         else:
             assert self.current_sample.averages is not None
             self.current_sample = self.current_sample.aggregate(sample)
+        assert self.current_sample is not None
 
     def write_subreport(self) -> None:
         assert self.current_sample is not None
diff --git a/test/test_aggregation.py b/test/test_aggregation.py
index 086306da..b5081bbb 100644
--- a/test/test_aggregation.py
+++ b/test/test_aggregation.py
@@ -1,3 +1,4 @@
+from typing import cast
 from unittest import mock
 import pytest
 from con_duct.__main__ import EXECUTION_SUMMARY_FORMAT, ProcessStats, Report, Sample
@@ -52,6 +53,10 @@ def test_aggregation_num_samples_increment(mock_log_paths: mock.MagicMock) -> No
     assert report.current_sample is None
     assert report.full_run_stats.averages.num_samples == 0
     report.update_from_sample(ex0)
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
     assert report.current_sample.averages.num_samples == 1
     assert report.full_run_stats.averages.num_samples == 1
     report.update_from_sample(ex0)
@@ -74,6 +79,11 @@ def test_aggregation_single_sample_sanity(mock_log_paths: mock.MagicMock) -> Non
     assert report.full_run_stats.averages.num_samples == 0
     report.update_from_sample(ex0)
     # 3 pids in a single sample should still be "1" sample
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
+    assert report.full_run_stats is not None
     assert report.current_sample.averages.num_samples == 1
     assert report.full_run_stats.averages.num_samples == 1
 
@@ -104,6 +114,10 @@ def test_aggregation_single_stat_multiple_samples_sanity(
     report.update_from_sample(ex0)
     report.update_from_sample(ex0)
     report.update_from_sample(ex0)
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
     assert report.current_sample.averages.num_samples == 3
     assert report.full_run_stats.averages.num_samples == 3
 
@@ -146,6 +160,10 @@ def test_aggregation_averages(mock_log_paths: mock.MagicMock) -> None:
     report.update_from_sample(sample0)
     report.update_from_sample(sample1)
     report.update_from_sample(sample2)
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
     assert report.current_sample.averages.num_samples == 3
     assert report.full_run_stats.averages.num_samples == 3
 
@@ -211,6 +229,10 @@ def test_aggregation_current_ave_diverges_from_total_ave(
     report.update_from_sample(sample0)
     report.update_from_sample(sample1)
     report.update_from_sample(sample2)
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
     assert report.current_sample.averages.num_samples == 3
     assert report.full_run_stats.averages.num_samples == 3
     # full_run_stats.averages is still identical to current_sample
@@ -224,6 +246,10 @@ def test_aggregation_current_ave_diverges_from_total_ave(
     report.update_from_sample(sample2)
     report.update_from_sample(sample2)
     report.update_from_sample(sample2)
+    report.current_sample = cast(
+        Sample, report.current_sample
+    )  # So mypy is convcinced it is not None
+    assert report.current_sample is not None
     assert report.current_sample.averages.num_samples == 3
     assert report.full_run_stats.averages.num_samples == 6