diff --git a/src/sp_repo_review/checks/precommit.py b/src/sp_repo_review/checks/precommit.py
index 67189b2c..d6c2ee5c 100644
--- a/src/sp_repo_review/checks/precommit.py
+++ b/src/sp_repo_review/checks/precommit.py
@@ -149,7 +149,11 @@ class PC191(PreCommit):
     repos = {"https://github.com/astral-sh/ruff-pre-commit"}
 
     @classmethod
-    def check(cls, precommit: dict[str, Any], ruff: dict[str, Any]) -> bool | None:  # type: ignore[override]
+    def check(  # type: ignore[override]
+        cls,
+        precommit: dict[str, Any],
+        ruff: dict[str, Any] | None,
+    ) -> bool | None:
         """
         If `--fix` is present, `--show-fixes` must be too.
         """
@@ -161,7 +165,9 @@ def check(cls, precommit: dict[str, Any], ruff: dict[str, Any]) -> bool | None:
                         and "args" in hook
                         and "--fix" in hook["args"]
                     ):
-                        return "--show-fixes" in hook["args"] or "show-fixes" in ruff
+                        return "--show-fixes" in hook["args"] or (
+                            ruff is not None and "show-fixes" in ruff
+                        )
                 return None
         return False
 
diff --git a/tests/test_precommit.py b/tests/test_precommit.py
index 618a39c7..595c6bc3 100644
--- a/tests/test_precommit.py
+++ b/tests/test_precommit.py
@@ -200,7 +200,8 @@ def test_pc191_ruffconfig(ruff_check: str):
     assert compute_check("PC191", precommit=precommit, ruff={"show-fixes": True}).result
 
 
-def test_pc191_no_show_fixes(ruff_check: str):
+@pytest.mark.parametrize("ruffconfig", [{}, None])
+def test_pc191_no_show_fixes(ruff_check: str, ruffconfig):
     precommit = yaml.safe_load(f"""
         repos:
           - repo: https://github.com/astral-sh/ruff-pre-commit
@@ -208,7 +209,7 @@ def test_pc191_no_show_fixes(ruff_check: str):
               - id: {ruff_check}
                 args: ["--fix"]
     """)
-    res = compute_check("PC191", precommit=precommit, ruff={})
+    res = compute_check("PC191", precommit=precommit, ruff=ruffconfig)
     assert not res.result
     assert "--show-fixes" in res.err_msg