diff --git a/srsenb/src/phy/phy.cc b/srsenb/src/phy/phy.cc
index e211b157c..db0f75831 100644
--- a/srsenb/src/phy/phy.cc
+++ b/srsenb/src/phy/phy.cc
@@ -349,7 +349,9 @@ void phy::configure_mbsfn(srsran::sib2_mbms_t* sib2, srsran::sib13_t* sib13, con
 // Start GUI
 void phy::start_plot()
 {
-  lte_workers[0]->start_plot();
+  if (lte_workers.get_nof_workers() > 0) {
+    lte_workers[0]->start_plot();
+  }
 }
 
 int phy::init_nr(const phy_args_t& args, const phy_cfg_t& cfg, stack_interface_phy_nr& stack)