diff --git a/src/main/webapp/js/main.js b/src/main/webapp/js/main.js
index 43b7569..cca2212 100644
--- a/src/main/webapp/js/main.js
+++ b/src/main/webapp/js/main.js
@@ -780,7 +780,8 @@ buildAlgortihmList = function() {
 	$("#algorithm-params-div").empty();
 
 	for (var i = 0; i < jsonContent.output.result.length; i++) {
-		if (jsonContent.output.result[i] === undefined) {
+		if (typeof jsonContent.output.result[i] === 'undefined'
+				|| jsonContent.output.result[i] == null) {
 			console.log("No result for " + i);
 		} else {
 			var cb = "<div class='alg-info-p'><input type='checkbox' name='foo-ner-algs' checked named='"
@@ -980,12 +981,17 @@ filterAlgorithmsByAnnotation = function() {
  */
 checkAnnotation = function(annotation) {
 	for (var i = 0; i < jsonContent.output.result.length; i++) {
-		var entities = jsonContent.output.result[i].entities;
-		for (var j = 0; j < entities.length; j++) {
-			a = entities[j][annotation];
-			if (typeof a != 'undefined') {
-				if (a.length > 0)
-					return true;
+		if (typeof jsonContent.output.result[i] === 'undefined'
+				|| jsonContent.output.result[i] == null) {
+			console.log("No result for " + i);
+		} else {
+			var entities = jsonContent.output.result[i].entities;
+			for (var j = 0; j < entities.length; j++) {
+				a = entities[j][annotation];
+				if (typeof a != 'undefined') {
+					if (a.length > 0)
+						return true;
+				}
 			}
 		}
 	}