diff --git a/lib/widget.js b/lib/widget.js
index c769524..8f93298 100644
--- a/lib/widget.js
+++ b/lib/widget.js
@@ -651,24 +651,22 @@ Screen.prototype.deleteTop = function(top, bottom) {
   return this.deleteLine(1, top, top, bottom);
 };
 
+// Parse the sides of an element to determine
+// whether an element has uniform cells on
+// both sides. If it does, we can use CSR to
+// optimize scrolling on a scrollable element.
 // Not exactly sure how worthwile this is.
 // This will cause a performance/cpu-usage hit,
 // but will it be less or greater than the
 // performance hit of slow-rendering scrollable
 // boxes with clean sides?
 Screen.prototype.cleanSides = function(el) {
-  if (!el._lastPos) {
+  var pos = el._lastPos;
+
+  if (!pos) {
     return false;
   }
 
-  var pos = el._lastPos
-    , yi = pos.yi + (el.border ? 1 : 0) + el.padding
-    , yl = pos.yl - (el.border ? 1 : 0) - el.padding
-    , first = this.olines[yi][pos.xi - 1]
-    , ch
-    , x
-    , y;
-
   if (pos._cleanSides != null) {
     return pos._cleanSides;
   }
@@ -677,6 +675,13 @@ Screen.prototype.cleanSides = function(el) {
     return pos._cleanSides = true;
   }
 
+  var yi = pos.yi + (el.border ? 1 : 0) + el.padding
+    , yl = pos.yl - (el.border ? 1 : 0) - el.padding
+    , first = this.olines[yi][pos.xi - 1]
+    , ch
+    , x
+    , y;
+
   for (y = yi; y < yl; y++) {
     for (x = pos.xi - 1; x >= 0; x--) {
       ch = this.olines[y][x];
@@ -867,7 +872,6 @@ Screen.prototype._reduceColor = function(col) {
   if (this.tput) {
     if (col >= 16 && this.tput.colors <= 16) {
       col = colors.ccolors[col];
-      if (col == null) col = 0;
     } else if (col >= 8 && this.tput.colors <= 8) {
       col -= 8;
     } else if (col >= 2 && this.tput.colors <= 2) {