diff --git a/bower.json b/bower.json
index 1f157657b..9f792c8c3 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.1.220",
+  "version": "1.1.222",
   "main": [
     "build/pdf.js",
     "build/pdf.worker.js"
diff --git a/build/pdf.combined.js b/build/pdf.combined.js
index 40ba8106a..a8b5bca4f 100644
--- a/build/pdf.combined.js
+++ b/build/pdf.combined.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.220';
-PDFJS.build = 'd504cde';
+PDFJS.version = '1.1.222';
+PDFJS.build = '18e1a14';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -17608,6 +17608,10 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
               }
               // eagerly compile XForm objects
               var name = args[0].name;
+              if (!name) {
+                warn('XObject must be referred to by name.');
+                continue;
+              }
               if (imageCache[name] !== undefined) {
                 operatorList.addOp(imageCache[name].fn, imageCache[name].args);
                 args = null;
diff --git a/build/pdf.js b/build/pdf.js
index f380a0217..73083fd68 100644
--- a/build/pdf.js
+++ b/build/pdf.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.220';
-PDFJS.build = 'd504cde';
+PDFJS.version = '1.1.222';
+PDFJS.build = '18e1a14';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
diff --git a/build/pdf.worker.js b/build/pdf.worker.js
index 26abf0f8f..b6f4c2c69 100644
--- a/build/pdf.worker.js
+++ b/build/pdf.worker.js
@@ -22,8 +22,8 @@ if (typeof PDFJS === 'undefined') {
   (typeof window !== 'undefined' ? window : this).PDFJS = {};
 }
 
-PDFJS.version = '1.1.220';
-PDFJS.build = 'd504cde';
+PDFJS.version = '1.1.222';
+PDFJS.build = '18e1a14';
 
 (function pdfjsWrapper() {
   // Use strict in our context only - users might not want it
@@ -11254,6 +11254,10 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
               }
               // eagerly compile XForm objects
               var name = args[0].name;
+              if (!name) {
+                warn('XObject must be referred to by name.');
+                continue;
+              }
               if (imageCache[name] !== undefined) {
                 operatorList.addOp(imageCache[name].fn, imageCache[name].args);
                 args = null;
diff --git a/package.json b/package.json
index f0a12f79f..aa825c456 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pdfjs-dist",
-  "version": "1.1.220",
+  "version": "1.1.222",
   "description": "Generic build of Mozilla's PDF.js library.",
   "keywords": [
     "Mozilla",