diff --git a/bin/Lib/GraphABC.pas b/bin/Lib/GraphABC.pas
index b9ce087c7..8c6916351 100644
--- a/bin/Lib/GraphABC.pas
+++ b/bin/Lib/GraphABC.pas
@@ -3967,6 +3967,7 @@ begin
     readbuffer := ed.Text + Environment.NewLine;
     IOPanel.Invoke(SetIOPanelInVisible);
     MainThread.Resume;
+    e.SuppressKeyPress := true;
   end;
 end;