diff --git a/petab/__init__.py b/petab/__init__.py
index 348f1269..23b376c2 100644
--- a/petab/__init__.py
+++ b/petab/__init__.py
@@ -26,7 +26,15 @@ def __getattr__(name):
         return importlib.import_module("petab.v1")
     if name == "v2":
         return importlib.import_module("petab.v2")
-    if name not in ("__path__", "__all__", "__wrapped__"):
+    if name not in (
+        "__path__",
+        "__all__",
+        "__wrapped__",
+        # accessed under pytest
+        "_pytestfixturefunction",
+        "__test__",
+        "__bases__",
+    ):
         warn(
             f"Accessing `petab.{name}` is deprecated and will be removed in "
             f"the next major release. Please use `petab.v1.{name}` instead.",
diff --git a/petab/v2/petab1to2.py b/petab/v2/petab1to2.py
index e3bd4f2d..a5101a2e 100644
--- a/petab/v2/petab1to2.py
+++ b/petab/v2/petab1to2.py
@@ -494,7 +494,7 @@ def update_prior(row):
         if new_prior_type == "log10-normal":
             warnings.warn(
                 f"Prior distribution `{new_prior_type}' for parameter "
-                f"`{row.name}' is not supported in PEtab v2. "
+                f"`{row[v1.C.PARAMETER_ID]}' is not supported in PEtab v2. "
                 "Using `log-normal` instead.",
                 # call to `petab1to2`
                 stacklevel=9,
@@ -504,7 +504,7 @@ def update_prior(row):
         if new_prior_type not in v2.C.PRIOR_DISTRIBUTIONS:
             raise NotImplementedError(
                 f"PEtab v2 does not support prior type `{new_prior_type}' "
-                f"required for parameter `{row.name}'."
+                f"required for parameter `{row[v1.C.PARAMETER_ID]}'."
             )
 
         return new_prior_type