diff --git a/tardis/transport/montecarlo/r_packet_transport.py b/tardis/transport/montecarlo/r_packet_transport.py
index c33b0e21be5..3df8939feff 100644
--- a/tardis/transport/montecarlo/r_packet_transport.py
+++ b/tardis/transport/montecarlo/r_packet_transport.py
@@ -141,7 +141,6 @@ def trace_packet(
             interaction_type = InteractionType.LINE  # Line
             r_packet.last_interaction_in_nu = r_packet.nu
             r_packet.last_line_interaction_in_id = cur_line_id
-            r_packet.last_line_interaction_shell_id = r_packet.current_shell_id
             r_packet.next_line_id = cur_line_id
             distance = distance_trace
             break