diff --git a/src/Screen.cpp b/src/Screen.cpp
index bb6068dab..8bd91aeeb 100644
--- a/src/Screen.cpp
+++ b/src/Screen.cpp
@@ -307,6 +307,9 @@ void Screen::insertChars(int n)
 {
   if (n == 0) n = 1; // Default
 
+  if ( screenLines[cuY].size() < cuX )
+    screenLines[cuY].resize(cuX);
+
   screenLines[cuY].insert(cuX,n,' ');
 
   if ( screenLines[cuY].count() > columns )
diff --git a/src/TerminalDisplay.cpp b/src/TerminalDisplay.cpp
index ca123106d..48296812b 100644
--- a/src/TerminalDisplay.cpp
+++ b/src/TerminalDisplay.cpp
@@ -1281,7 +1281,7 @@ void TerminalDisplay::drawContents(QPainter &paint, const QRect &rect)
 		 //reset back to single-width, single-height _lines 
 		 paint.resetMatrix();
 
-		 if (y < _lineProperties.size())
+		 if (y < _lineProperties.size()-1)
 		 {
 			//double-height _lines are represented by two adjacent _lines 
             //containing the same characters