diff --git a/common/src/main/resources/static/common/base64.js b/common/src/main/resources/static/common/base64.js
index af766b54..bbda3727 100644
--- a/common/src/main/resources/static/common/base64.js
+++ b/common/src/main/resources/static/common/base64.js
@@ -9,7 +9,7 @@
 	 
 	    // public method for encoding
 	    this.encode = function (input) {
-	        var output = "";
+	        var output = ""; if (!input || input==''){return output};
 	        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
 	        var i = 0;
 	        input = _utf8_encode(input);
@@ -35,7 +35,7 @@
 	 
 	    // public method for decoding
 	    this.decode = function (input) {
-	        var output = "";
+	        var output = ""; if (!input || input==''){return output};
 	        var chr1, chr2, chr3;
 	        var enc1, enc2, enc3, enc4;
 	        var i = 0;