diff --git a/protzilla/run_v2.py b/protzilla/run_v2.py
index b8b4da79..ff41b6fd 100644
--- a/protzilla/run_v2.py
+++ b/protzilla/run_v2.py
@@ -27,7 +27,7 @@ def get_available_runinfo() -> tuple[list[dict[str, str | list[str]]], list[dict
         return []
     runs = []
     runs_favourited = []
-    all_tags = {}
+    all_tags = set()
     for directory in paths.RUNS_PATH.iterdir():
         if directory.name.startswith("."):
             continue
diff --git a/ui/runs/views.py b/ui/runs/views.py
index 6d5d423f..6b6f4ac1 100644
--- a/ui/runs/views.py
+++ b/ui/runs/views.py
@@ -263,7 +263,7 @@ def add_tag(request: HttpRequest):
         tags = metadata.get("tags")
     tags.append(run_tag)
     metadata["tags"]= tags
-    yaml_operator.write(metadata_yaml_path, metadata)
+    yaml_operator.write(Path(metadata_yaml_path), metadata)
 
     return HttpResponseRedirect(reverse("runs:index"))