diff --git a/tools/lammps-gui/chartviewer.cpp b/tools/lammps-gui/chartviewer.cpp
index 919a3bf5fe..22f8e2f32b 100644
--- a/tools/lammps-gui/chartviewer.cpp
+++ b/tools/lammps-gui/chartviewer.cpp
@@ -138,7 +138,8 @@ void ChartWindow::quit()
 void ChartWindow::reset_zoom()
 {
     int choice = columns->currentData().toInt();
-    charts[choice]->reset_zoom();
+    if ((choice >= 0) && (choice < charts.size()))
+        charts[choice]->reset_zoom();
 }
 
 void ChartWindow::stop_run()