diff --git a/js/devel/app.js b/js/devel/app.js
index 337f0ee..851d3d0 100644
--- a/js/devel/app.js
+++ b/js/devel/app.js
@@ -63,6 +63,10 @@ var ContactRenderer = {
 		}
 	},
 	generateFirstCharacter: function (input) {
+		if (typeof input !== 'string') {
+			return '?';
+		}
+
 		if (input.charAt(0) === '+') {
 			return '#';
 		}