diff --git a/lib/widget.js b/lib/widget.js
index 8a6a78a..a2bf6a6 100644
--- a/lib/widget.js
+++ b/lib/widget.js
@@ -4175,7 +4175,7 @@ Screen.prototype._dockBorders = function() {
     for (x = 0; x < this.width; x++) {
       ch = lines[y][x][1];
       if (angles[ch]) {
-        lines[y][x][1] = getAngle(x, y, lines);
+        lines[y][x][1] = getAngle(lines, x, y);
       }
     }
   }
@@ -8627,7 +8627,7 @@ Object.keys(angleTable).forEach(function(key) {
   delete angleTable[key];
 });
 
-function getAngle(x, y, lines) {
+function getAngle(lines, x, y) {
   var angle = 0
     , attr = lines[y][x][0]
     , ch = lines[y][x][1];
@@ -8663,10 +8663,12 @@ function darken(attr) {
     bg -= 8;
   } else {
     var name = colors.ncolors[bg];
-    for (var i = 0; i < colors.ncolors.length; i++) {
-      if (name === colors.ncolors[i] && bg !== i) {
-        bg = i;
-        break;
+    if (name) {
+      for (var i = 0; i < colors.ncolors.length; i++) {
+        if (name === colors.ncolors[i] && bg !== i) {
+          bg = i;
+          break;
+        }
       }
     }
   }
@@ -8680,10 +8682,12 @@ function darken(attr) {
     fg -= 8;
   } else {
     var name = colors.ncolors[fg];
-    for (var i = 0; i < colors.ncolors.length; i++) {
-      if (name === colors.ncolors[i] && fg !== i) {
-        fg = i;
-        break;
+    if (name) {
+      for (var i = 0; i < colors.ncolors.length; i++) {
+        if (name === colors.ncolors[i] && fg !== i) {
+          fg = i;
+          break;
+        }
       }
     }
   }