diff --git a/src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc b/src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc
index 31b454098e1..78de8b35659 100644
--- a/src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc
+++ b/src/core/ext/filters/client_channel/lb_policy/grpclb/grpclb.cc
@@ -1207,7 +1207,9 @@ void GrpcLb::FillChildRefsForChannelz(
     channelz::ChildRefsList* child_subchannels,
     channelz::ChildRefsList* child_channels) {
   // delegate to the RoundRobin to fill the children subchannels.
-  rr_policy_->FillChildRefsForChannelz(child_subchannels, child_channels);
+  if (rr_policy_ != nullptr) {
+    rr_policy_->FillChildRefsForChannelz(child_subchannels, child_channels);
+  }
   if (lb_channel_ != nullptr) {
     grpc_core::channelz::ChannelNode* channel_node =
         grpc_channel_get_channelz_node(lb_channel_);