diff --git a/src/routes/answers.py b/src/routes/answers.py
index 6145e8f..a3ff8bc 100644
--- a/src/routes/answers.py
+++ b/src/routes/answers.py
@@ -99,8 +99,7 @@ def submit_refinement():
         socket2observer[sid] = obs
         subject.registerObserver(obs)
 
-    t = Thread(target=subject.launch_task, args=(validated,), daemon=True)
-    t.start()
+    subject.launch_task(validated)
     url = url_for(f".status", id=process_id, _external=True)
     return jsonify(
         {
diff --git a/src/utils/observer.py b/src/utils/observer.py
index 8d88c27..6529701 100644
--- a/src/utils/observer.py
+++ b/src/utils/observer.py
@@ -1,6 +1,7 @@
 from abc import ABC, abstractmethod
 from enum import Enum
-from typing import Callable, Optional, Set, Any
+from threading import Thread
+from typing import Callable, Iterable, Mapping, Optional, Set, Any
 
 
 class Status(Enum):
@@ -61,9 +62,17 @@ class Subject:
 
     def launch_task(self, *args, **kwargs):
         self.status = Status.PROCESSING
-        self.task(
-            *args, **kwargs, percent_cb=self.notifyPercentage, complete_cb=self.notifyComplete
+        t = Thread(
+            target=self.task,
+            args=args,
+            kwargs={
+                **kwargs,
+                "percent_cb": self.notifyPercentage,
+                "complete_cb": self.notifyComplete,
+            },
+            daemon=True,
         )
+        t.start()
 
 
 request2status: dict[str, Subject] = {}