diff --git a/app/controllers/submissions_controller.rb b/app/controllers/submissions_controller.rb
index 58e5564b..a93c4a95 100644
--- a/app/controllers/submissions_controller.rb
+++ b/app/controllers/submissions_controller.rb
@@ -105,24 +105,19 @@ class SubmissionsController < ApplicationController
     # are registered first, the runner socket may still be nil.
     client_socket, runner_socket = nil
 
-    @tubesock_debug_events = []
-    client_kill = false
     hijack do |tubesock|
       client_socket = tubesock
 
-      client_socket.onopen do |event|
-        @tubesock_debug_events << {type: :open, data: event}
+      client_socket.onopen do |_event|
         kill_client_socket(client_socket) and return true if @embed_options[:disable_run]
       end
 
-      client_socket.onclose do |event|
-        @tubesock_debug_events << {type: :close, data: event}
+      client_socket.onclose do |_event|
         runner_socket&.close(:terminated_by_client)
         @testrun[:status] ||= :terminated_by_client
       end
 
       client_socket.onmessage do |raw_event|
-        @tubesock_debug_events << {type: :message, data: raw_event}
         # Obviously, this is just flushing the current connection: Filtering.
         next if raw_event == "\n"
 
@@ -138,7 +133,6 @@ class SubmissionsController < ApplicationController
 
         case event[:cmd]
           when :client_kill
-            client_kill = true
             @testrun[:status] = :terminated_by_client
             close_client_connection(client_socket)
             Rails.logger.debug('Client exited container.')
@@ -163,10 +157,6 @@ class SubmissionsController < ApplicationController
         Sentry.set_extras(data: raw_event)
         Sentry.capture_exception(e)
       end
-
-      client_socket.onerror do |event|
-        @tubesock_debug_events << {type: :error, data: event}
-      end
     end
 
     # If running is not allowed (and the socket is closed), we can stop here.
@@ -176,7 +166,6 @@ class SubmissionsController < ApplicationController
     durations = @submission.run(@file) do |socket, starting_time|
       runner_socket = socket
       @testrun[:starting_time] = starting_time
-      @tubesock_debug_events << {type: :send, data: {cmd: :status, status: :container_running}}
       client_socket.send_data JSON.dump({cmd: :status, status: :container_running})
 
       runner_socket.on :stdout do |data|
@@ -248,13 +237,11 @@ class SubmissionsController < ApplicationController
     Sentry.capture_exception(e)
     extract_durations(e)
   ensure
-    close_client_connection(client_socket) unless client_kill
+    close_client_connection(client_socket)
     save_testrun_output 'run'
-    Sentry.capture_message('Execution got terminated by client', extra: {websocket: @tubesock_debug_events, submission: @submission.id}) if @testrun[:status] == :terminated_by_client && !client_kill
   end
 
   def score
-    @tubesock_debug_events = []
     client_socket = nil
     disable_scoring = @embed_options[:disable_score] || !@submission.exercise.teacher_defined_assessment?
 
@@ -300,7 +287,6 @@ class SubmissionsController < ApplicationController
   def statistics; end
 
   def test
-    @tubesock_debug_events = []
     client_socket = nil
 
     hijack do |tubesock|
@@ -354,7 +340,6 @@ class SubmissionsController < ApplicationController
     # We don't want to store this (arbitrary) exit command and redirect it ourselves
     client_socket.send_data JSON.dump({cmd: :exit})
     client_socket.send_data nil, :close
-    @tubesock_debug_events << {type: :send, data: {cmd: :exit}}
     # We must not close the socket manually (with `client_socket.close`), as this would close it twice.
     # When the socket is closed twice, nginx registers a `Connection reset by peer` error.
     # Tubesock automatically closes the socket when the `hijack` block ends and otherwise ignores `Errno::ECONNRESET`.
@@ -416,7 +401,6 @@ class SubmissionsController < ApplicationController
                           end
     @testrun[:messages].push message
     @testrun[:status] = message[:status] if message[:status]
-    @tubesock_debug_events << {type: :send, data: message}
     client_socket.send_data JSON.dump(message)
   end