1 files changed, 16 insertions, 4 deletions
diff --git a/lib/plugins/plugin.js b/lib/plugins/plugin.js
index 64ae75f..0216a18 100644
--- a/lib/plugins/plugin.js
+++ b/lib/plugins/plugin.js
@@ -7,6 +7,12 @@ var error = require('../utils/error');
 var gitbook = require('../gitbook');
 var registry = require('./registry');
 
+// Return true if an error is a "module not found"
+function isModuleNotFound(err) {
+    return err.message.indexOf('Cannot find module') >= 0;
+}
+
+
 function BookPlugin(book, pluginId) {
     this.book = book;
     this.log = this.book.log;
@@ -47,7 +53,7 @@ BookPlugin.prototype.load = function() {
             that.packageInfos = require(res);
         } catch (err) {
             // Wait on https://github.com/substack/node-resolve/pull/81 to be merged
-            if (err.message.indexOf('Cannot find module') < 0) throw err;
+            if (!isModuleNotFound(err)) throw err;
 
             that.packageInfos = undefined;
             that.content = undefined;
@@ -59,9 +65,15 @@ BookPlugin.prototype.load = function() {
         try {
             that.content = require(resolve.sync(that.npmId, { basedir: baseDir }));
         } catch(err) {
-            throw new error.PluginError(err, {
-                plugin: that.id
-            });
+            // It's no big deal if the plugin doesn't have an "index.js"
+            // (For example: themes)
+            if (isModuleNotFound(err)) {
+                that.content = {};
+            } else {
+                throw new error.PluginError(err, {
+                    plugin: that.id
+                });
+            }
         }
 
         return true;