diff --git a/dencoder.js b/dencoder.js
index 615cf0a..033bd64 100644
--- a/dencoder.js
+++ b/dencoder.js
@@ -36,7 +36,11 @@
 			"id": "decodeuri",
 			"name": "Decode URI",
 			"convert": function(input) {
-				return decodeURI(input)
+				try {
+					return decodeURI(input)
+				} catch (exception) {
+					return "Invalid URI string.";
+				}
 			}
 		},
 		{
@@ -52,7 +56,11 @@
 			"id": "decodeuricomponent",
 			"name": "Decode URI component",
 			"convert": function(input) {
-				return decodeURIComponent(input)
+				try {
+					return decodeURIComponent(input)
+				} catch (exception) {
+					return "Invalid URI component string.";
+				}
 			}
 		}
 	];