diff --git a/clearml/backend_interface/task/task.py b/clearml/backend_interface/task/task.py
index d0a0e8d5..c648224a 100644
--- a/clearml/backend_interface/task/task.py
+++ b/clearml/backend_interface/task/task.py
@@ -654,10 +654,12 @@ class Task(IdObjectBase, AccessMixin, SetupUploadMixin):
                 return a_name
             return "{}.{}".format(a_name[: max(2, max_length - len(uuid) - 1)], uuid)
 
+        project_name = self.get_project_name() or "unknown"
+
         return "/".join(
             quote(x, safe="'[]{}()$^,.; -_+-=/")
             for x in (
-                limit_folder_name(self.get_project_name(), str(self.project), 256, False),
+                limit_folder_name(project_name, str(self.project), 256, False),
                 limit_folder_name(self.name, str(self.data.id), 128, True),
                 extra_path,
             )
diff --git a/clearml/binding/artifacts.py b/clearml/binding/artifacts.py
index 4b69d697..71467f51 100644
--- a/clearml/binding/artifacts.py
+++ b/clearml/binding/artifacts.py
@@ -1155,15 +1155,16 @@ class Artifacts(object):
         return self._temp_folder[0]
 
     def _get_storage_uri_prefix(self) -> str:
+        project_name = self._task.get_project_name() or "unknown"
         if (
             not self._storage_prefix
             or self._task_name != self._task.name
-            or self._project_name != self._task.get_project_name()
+            or self._project_name != project_name
         ):
             # noinspection PyProtectedMember
             self._storage_prefix = self._task._get_output_destination_suffix()
             self._task_name = self._task.name
-            self._project_name = self._task.get_project_name()
+            self._project_name = project_name
         return self._storage_prefix
 
     def _store_compressed_pd_csv(