diff --git a/lib/modules/fields/pull.js b/lib/modules/fields/pull.js
index 566ccf4..a9e528a 100644
--- a/lib/modules/fields/pull.js
+++ b/lib/modules/fields/pull.js
@@ -91,7 +91,9 @@ proto._pullOne = function(fieldName, pullValue, options) {
 
       // Check if a value is present in an array.
       if (!_.find(nestedDoc[nestedFieldName], function(value) {
-        value = field.plain(value);
+        if (field) {
+          value = field.plain(value);
+        }
         return EJSON.equals(value, pullValue);
       })) {
         return;
@@ -132,7 +134,9 @@ proto._pullOne = function(fieldName, pullValue, options) {
       nestedDoc[nestedFieldName] = _.filter(
         nestedDoc[nestedFieldName],
         function(value) {
-          value = field.plain(value);
+          if (field) {
+            value = field.plain(value);
+          }
           return !EJSON.equals(value, pullValue);
         }
       );