diff --git a/package.json b/package.json
index 39364e6..1d3e8ad 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@uci-utils/ready",
-  "version": "0.3.0",
+  "version": "0.3.1",
   "description": "A Class to Observe the reduced to boolean combined state of a map of observables",
   "main": "src/ready.js",
   "scripts": {
diff --git a/src/ready.js b/src/ready.js
index 92ba344..14447ae 100644
--- a/src/ready.js
+++ b/src/ready.js
@@ -137,7 +137,7 @@ class Ready extends Map {
 
   // TODO have combineObservers call this
   makeCombination(observers,list){
-    observers = observers.filter(obs=>obs._readyType)
+    observers = observers.filter(obs=>(obs || {})._readyType)
     if (!observers.length) return false
     let combination = combineLatest(observers).pipe(
       tap(states => { if (list) this.log(list.map((name,index) => [name,states[index]]))}),
@@ -145,6 +145,7 @@ class Ready extends Map {
       changed(), //filters out emission if it is unchanged from last  TODO replace with distinctUntilChanged
       shareReplay(1)
     )
+    combination._readyType = true
     return combination
   }