diff --git a/src/Screen.cpp b/src/Screen.cpp
index 7661aebc..89506598 100644
--- a/src/Screen.cpp
+++ b/src/Screen.cpp
@@ -320,6 +320,9 @@ void Screen::deleteLines(int n)
 
 void Screen::insertLines(int n)
 {
+    if (_cuY < _topMargin) {
+        return;
+    }
     if (n < 1) {
         n = 1; // Default
     }