diff --git a/NEWS b/NEWS
index dcc96cc83..b88ce7c0d 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,16 @@
+2.3.4 (YYYY-MM-DD)
+------------------
+
+New features
+ - 
+
+Enhancements
+ - 
+ 
+
+Bug fixes
+ - JavaScript exception when printing events from calendars with no assigned color (#3203)
+
 2.3.3a (2015-11-18)
 -------------------
 
diff --git a/UI/WebServerResources/generic.js b/UI/WebServerResources/generic.js
index 6eb5270a1..3b11a8183 100644
--- a/UI/WebServerResources/generic.js
+++ b/UI/WebServerResources/generic.js
@@ -440,17 +440,23 @@ function onAjaxRequestStateChange(http) {
 
 /* taken from Lightning */
 function getContrastingTextColor(bgColor) {
-    var calcColor = bgColor.substring(1);
-    var red = parseInt(calcColor.substring(0, 2), 16);
-    var green = parseInt(calcColor.substring(2, 4), 16);
-    var blue = parseInt(calcColor.substring(4, 6), 16);
+    var textColor = "black";
+    if (bgColor) {
+        var calcColor = bgColor.substring(1);
+        var red = parseInt(calcColor.substring(0, 2), 16);
+        var green = parseInt(calcColor.substring(2, 4), 16);
+        var blue = parseInt(calcColor.substring(4, 6), 16);
 
-    // Calculate the brightness (Y) value using the YUV color system.
-    var brightness = (0.299 * red) + (0.587 * green) + (0.114 * blue);
+        // Calculate the brightness (Y) value using the YUV color system.
+        var brightness = (0.299 * red) + (0.587 * green) + (0.114 * blue);
 
-    // Consider all colors with less than 56% brightness as dark colors and
-    // use white as the foreground color, otherwise use black.
-    return ((brightness < 144) ? "white" : "black");
+        // Consider all colors with less than 56% brightness as dark colors and
+        // use white as the foreground color, otherwise use black.
+        if (brightness < 144)
+            textColor = "white";
+    }
+
+    return textColor;
 }
 
 function triggerAjaxRequest(url, callback, userdata, content, headers, attempt) {