diff --git a/call/call.cc b/call/call.cc
index 06ccd00..9678360 100644
--- a/call/call.cc
+++ b/call/call.cc
@@ -465,6 +465,7 @@
       transport_send_ptr_(transport_send.get()),
       transport_send_(std::move(transport_send)) {
   RTC_DCHECK(config.event_log != nullptr);
+  RTC_DCHECK(config.trials != nullptr);
   worker_sequence_checker_.Detach();
 
   call_stats_->RegisterStatsObserver(&receive_side_cc_);