diff --git a/merger/InteractiveMergerSubprocessor.py b/merger/InteractiveMergerSubprocessor.py
index bbec108..820718c 100644
--- a/merger/InteractiveMergerSubprocessor.py
+++ b/merger/InteractiveMergerSubprocessor.py
@@ -21,6 +21,7 @@ class InteractiveMergerSubprocessor(Subprocessor):
     class Frame(object):
         def __init__(self, prev_temporal_frame_infos=None,
                            frame_info=None,
+                           parallel_frame_info=None,
                            next_temporal_frame_infos=None):
             self.prev_temporal_frame_infos = prev_temporal_frame_infos
             self.frame_info = frame_info
@@ -570,4 +571,4 @@ class InteractiveMergerSubprocessor(Subprocessor):
 
     #override
     def get_result(self):
-        return 0
\ No newline at end of file
+        return 0