diff --git a/sys/dev/pci/drm/amd/display/dc/resource/dce80/dce80_resource.c b/sys/dev/pci/drm/amd/display/dc/resource/dce80/dce80_resource.c
index 8822d5818d2..b645c0c8ec3 100644
--- a/sys/dev/pci/drm/amd/display/dc/resource/dce80/dce80_resource.c
+++ b/sys/dev/pci/drm/amd/display/dc/resource/dce80/dce80_resource.c
@@ -734,7 +734,8 @@ static struct link_encoder *dce80_link_encoder_create(
 				      enc_init_data,
 				      &link_enc_feature,
 				      &link_enc_regs[link_regs_id],
-				      &link_enc_aux_regs[enc_init_data->channel - 1],
+				      enc_init_data->channel == CHANNEL_ID_UNKNOWN ?
+				      NULL : &link_enc_aux_regs[enc_init_data->channel - 1],
 				      enc_init_data->hpd_source >= ARRAY_SIZE(link_enc_hpd_regs) ?
 				      NULL : &link_enc_hpd_regs[enc_init_data->hpd_source]);
 	return &enc110->base;