diff --git a/hourglass/server/main.js b/hourglass/server/main.js
index 2105b55..0300f71 100644
--- a/hourglass/server/main.js
+++ b/hourglass/server/main.js
@@ -182,7 +182,8 @@ Meteor.methods({
             Meteor.user().profile.classes.indexOf(input.class) !== -1 &&
             found.banned.indexOf(Meteor.userId()) === -1 &&
             found.blockEdit.indexOf(Meteor.userId()) === -1 &&
-            input.dueDate.getTime() >= ref && worktype.indexOf(input.type) != -1 &&
+            input.dueDate instanceof Date && input.dueDate.getTime() >= ref && 
+            worktype.indexOf(input.type) != -1 &&
             input.name.length <= 50 && input.description.length <= 150) {
 
             input.confirmations = [Meteor.userId()];
@@ -229,7 +230,8 @@ Meteor.methods({
         } else if (Meteor.userId() === work.findOne({
                 _id: change._id
             }).creator) {
-            if (change.name.length <= 50 && worktype.indexOf(change.type) != -1 && input.dueDate.getTime() >= ref) {
+            if (change.name.length <= 50 && worktype.indexOf(change.type) != -1 &&
+             input.dueDate instanceof Date && input.dueDate.getTime() >= ref) {
                 Meteor.update({
                     _id: change._id
                 }, {