diff --git a/README.md b/README.md
index 3706ee5..067457a 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,7 @@ Assuming you are using [browserify][], [webpack][], [rollup][], or another bundl
 | -------------- | -------------------------- |
 | **BunKat**     |                            |
 | **Nick Baugh** | <http://niftylettuce.com/> |
+| **yrambler2001** | <https://yrambler2001.me/> |
 
 
 ## License
diff --git a/package.json b/package.json
index 12a0d33..cd396b5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@breejs/later",
   "description": "Maintained fork of later. Determine later (or previous) occurrences of recurring schedules",
-  "version": "4.0.2",
+  "version": "4.0.3",
   "author": "BunKat <bill@levelstory.com>",
   "bugs": {
     "url": "https://github.com/breejs/later/issues",
@@ -9,7 +9,8 @@
   },
   "contributors": [
     "BunKat <bill@levelstory.com>",
-    "Nick Baugh <niftylettuce@gmail.com> (http://niftylettuce.com/)"
+    "Nick Baugh <niftylettuce@gmail.com> (http://niftylettuce.com/)",
+    "yrambler2001 <yrambler2001@gmail.com> (https://yrambler2001.me/)"
   ],
   "dependencies": {},
   "devDependencies": {
diff --git a/src/index.js b/src/index.js
index 85e067b..5ddfd6b 100644
--- a/src/index.js
+++ b/src/index.js
@@ -841,9 +841,11 @@ later.compile = function (schedDef) {
   function compareFn(dir) {
     return dir === 'next'
       ? function (a, b) {
+          if (!a || !b) return true;
           return a.getTime() > b.getTime();
         }
       : function (a, b) {
+          if (!a || !b) return true;
           return b.getTime() > a.getTime();
         };
   }
@@ -1148,10 +1150,12 @@ later.schedule = function (sched) {
   function compareFn(dir) {
     return dir === 'next'
       ? function (a, b) {
-          return !b || a.getTime() > b.getTime();
+          if (!a || !b) return true;
+          return a.getTime() > b.getTime();
         }
       : function (a, b) {
-          return !a || b.getTime() > a.getTime();
+          if (!a || !b) return true;
+          return b.getTime() > a.getTime();
         };
   }