diff --git a/src/python/merge_analyzer.py b/src/python/merge_analyzer.py
index 77da0baeab..37d26975f5 100755
--- a/src/python/merge_analyzer.py
+++ b/src/python/merge_analyzer.py
@@ -63,15 +63,6 @@ def merge_analyzer(  # pylint: disable=too-many-locals
     left_success, _ = repo_left.checkout(merge_data["left"])
     right_success, _ = repo_right.checkout(merge_data["right"])
 
-    if not left_success:
-        raise Exception(
-            "git checkout failed: ", repo_left.repo_path, merge_data["left"]
-        )
-    if not right_success:
-        raise Exception(
-            "git checkout failed: ", repo_right.repo_path, merge_data["right"]
-        )
-
     # Compute diff size in lines between left and right
     assert repo_left.repo_path.exists()
     assert repo_right.repo_path.exists()
@@ -99,20 +90,36 @@ def merge_analyzer(  # pylint: disable=too-many-locals
     cache_data["diff_contains_java_file"] = contains_java_file
 
     # Test left parent
-    cache_data["left_tree_fingerprint"] = repo_left.compute_tree_fingerprint()
-    result, test_coverage = repo_left.test(TIMEOUT_TESTING_PARENT, N_TESTS)
-    cache_data["left parent test result"] = result.name
-    cache_data["left parent test coverage"] = test_coverage
-    cache_data["parents pass"] = is_test_passed(cache_data["left parent test result"])
+    if not left_success:
+        # This should never happen.  Search output for "Git_checkout_failed"
+        cache_data["left parent test result"] = TEST_STATE.Git_checkout_failed.name
+        cache_data["left_tree_fingerprint"] = None
+        cache_data["left parent test coverage"] = None
+        cache_data["parents pass"] = False
+    else:
+        cache_data["left_tree_fingerprint"] = repo_left.compute_tree_fingerprint()
+        result, test_coverage = repo_left.test(TIMEOUT_TESTING_PARENT, N_TESTS)
+        cache_data["left parent test result"] = result.name
+        cache_data["left parent test coverage"] = test_coverage
+        cache_data["parents pass"] = is_test_passed(
+            cache_data["left parent test result"]
+        )
 
     # Test right parent
-    cache_data["right_tree_fingerprint"] = repo_right.compute_tree_fingerprint()
-    result, test_coverage = repo_right.test(TIMEOUT_TESTING_PARENT, N_TESTS)
-    cache_data["right parent test result"] = result.name
-    cache_data["right parent test coverage"] = test_coverage
-    cache_data["parents pass"] = cache_data["parents pass"] and is_test_passed(
-        cache_data["right parent test result"]
-    )
+    if not right_success:
+        # This should never happen.  Search output for "Git_checkout_failed"
+        cache_data["right parent test result"] = TEST_STATE.Git_checkout_failed.name
+        cache_data["right_tree_fingerprint"] = None
+        cache_data["right parent test coverage"] = None
+        cache_data["parents pass"] = False
+    else:
+        cache_data["right_tree_fingerprint"] = repo_right.compute_tree_fingerprint()
+        result, test_coverage = repo_right.test(TIMEOUT_TESTING_PARENT, N_TESTS)
+        cache_data["right parent test result"] = result.name
+        cache_data["right parent test coverage"] = test_coverage
+        cache_data["parents pass"] = cache_data["parents pass"] and is_test_passed(
+            cache_data["right parent test result"]
+        )
 
     cache_data["test merge"] = (
         cache_data["parents pass"]
diff --git a/src/python/write_head_hashes.py b/src/python/write_head_hashes.py
index b401c7e2ff..1cdcd3b463 100755
--- a/src/python/write_head_hashes.py
+++ b/src/python/write_head_hashes.py
@@ -52,6 +52,7 @@ def clone_repo(repo_slug: str) -> git.repo.Repo:
         except Exception as e:
             print(repo_slug, "Exception during cloning:\n", e)
             raise
+    repo.remote().fetch("refs/pull/*/head:refs/remotes/origin/pull/*")
     return repo