diff --git a/golem/manager/nodestatesnapshot.py b/golem/manager/nodestatesnapshot.py
index c4799286b8..5b314323ed 100644
--- a/golem/manager/nodestatesnapshot.py
+++ b/golem/manager/nodestatesnapshot.py
@@ -12,12 +12,23 @@ def __init__(
             seconds_to_timeout: float,
             running_time_seconds: float,
             # extra_data:
-            outfilebasename: str,
-            output_format: str,
-            scene_file: str,
-            frames: List[int],
-            start_task: int,
-            total_tasks: int,
+
+            # TODO before release 0.21
+            #
+            # refactor this state snapshot so that it's independent from
+            # any particular application type
+            #
+            # + ensure that Electron front-end doesn't depend on this data
+            # being present here and/or having specific format
+            #
+            # https://github.com/golemfactory/golem/issues/4318
+
+            outfilebasename: str = None,
+            output_format: str = None,
+            scene_file: str = None,
+            frames: List[int] = None,
+            start_task: int = None,
+            total_tasks: int = None,
             # if there's something more in extra_data, just ignore it
             **_kwargs
     ) -> None:
diff --git a/golem/task/taskcomputer.py b/golem/task/taskcomputer.py
index 08557e1284..54acc54b04 100644
--- a/golem/task/taskcomputer.py
+++ b/golem/task/taskcomputer.py
@@ -215,14 +215,23 @@ def get_progress(self) -> Optional[ComputingSubtaskStateSnapshot]:
             return None
 
         c: TaskThread = self.counting_thread
+        try:
+            outfilebasename = c.extra_data.get(  # type: ignore
+                'crops'
+            )[0].get(
+                'outfilebasename'
+            )
+        except (IndexError, KeyError):
+            outfilebasename = ''
+
         tcss = ComputingSubtaskStateSnapshot(
             subtask_id=self.assigned_subtask['subtask_id'],
             progress=c.get_progress(),
             seconds_to_timeout=c.task_timeout,
             running_time_seconds=(time.time() - c.start_time),
+            outfilebasename=outfilebasename,
             **c.extra_data,
         )
-
         return tcss
 
     def is_computing(self) -> bool: