diff --git a/examples/themes.html b/examples/themes.html
index 117f892..6c9141b 100644
--- a/examples/themes.html
+++ b/examples/themes.html
@@ -23,7 +23,8 @@
     var book = ePub("https://s3.amazonaws.com/epubjs/books/alice/OPS/package.opf");
     var rendition = book.renderTo("viewer", {
       width: "100%",
-      height: 600
+      height: 600,
+      manager: "continuous"
     });
 
     rendition.display("chapter_007.xhtml");
@@ -90,11 +91,11 @@
       console.log(location);
     });
 
-    /*
-    rendition.themes.register("dark", "theme.css");
-    rendition.themes.register("light", "theme.css");
-    rendition.themes.register("tan", "theme.css");
-    */
+
+    rendition.themes.register("dark", "themes.css");
+    rendition.themes.register("light", "themes.css");
+    rendition.themes.register("tan", "themes.css");
+
 
 
     rendition.themes.default({
@@ -107,8 +108,8 @@
       }
     });
 
-    // rendition.themes.select("tan");
-    // rendition.themes.fontSize("140%");
+    rendition.themes.select("tan");
+    rendition.themes.fontSize("140%");
 
   </script>
 
diff --git a/package-lock.json b/package-lock.json
index 4356936..006a902 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "epubjs",
-  "version": "0.3.41",
+  "version": "0.3.46",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/src/managers/default/index.js b/src/managers/default/index.js
index 375b488..873d0b4 100644
--- a/src/managers/default/index.js
+++ b/src/managers/default/index.js
@@ -757,7 +757,10 @@ class DefaultViewManager {
 	getContents(){
 		var contents = [];
 		this.views.each(function(view){
-			contents.push(view.contents);
+			const viewContents = view.contents;
+			if (viewContents) {
+				contents.push(viewContents);
+			}
 		});
 		return contents;
 	}