diff --git a/bind/example.py b/bind/example.py
index b58be66..dd93507 100644
--- a/bind/example.py
+++ b/bind/example.py
@@ -8,6 +8,6 @@ cw.addLayer(10,"G4_Si",True, 3) #10 cm of Silicon, active, 3x3 segmentation
 
 G4s = G4System()
 G4s.init(cw)
-G4s.run_batch(100, "gamma", 1000, 5000) #100 events, photons, 1000 MeV to 5000 MeV
+#G4s.run_batch(100, "gamma", 1000, 5000) #100 events, photons, 1000 MeV to 5000 MeV
 
 G4s.run_visualize("gamma", 1000, 5000) 
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diff --git a/src/G4System.cc b/src/G4System.cc
index 7e36fa7..b5ba6ad 100644
--- a/src/G4System.cc
+++ b/src/G4System.cc
@@ -127,7 +127,4 @@ void G4System::check()const{
    if(UImanager == nullptr){
        throw std::runtime_error("UImanager not found");
    }
-   if(ui == nullptr){
-       throw std::runtime_error("UI not found");
-   }
 }
\ No newline at end of file