diff --git a/index.js b/index.js
index 9cad003..41f03ee 100644
--- a/index.js
+++ b/index.js
@@ -31,6 +31,10 @@ module.exports = function (options) {
     function check (file, enc, callback) {
         /*jshint validthis:true */
         var self = this;
+        if(!file.contents)
+        {
+            return callback();
+        }
         var contents = file.contents.toString('utf-8');
 
         // Remove all line breaks and add a circumflex in order to disable 'pipe mode'.
diff --git a/package.json b/package.json
index 82d222b..4442bb0 100644
--- a/package.json
+++ b/package.json
@@ -9,6 +9,7 @@
   "license": "MIT",
   "main": "index.js",
   "scripts": {
+    "preinstall": "echo 'This npm package requires installing aspell for development:' && sudo apt install aspell",
     "test": "gulp"
   },
   "repository": {