diff --git a/src/index.js b/src/index.js
index 2f0b737..a95771d 100644
--- a/src/index.js
+++ b/src/index.js
@@ -33,6 +33,9 @@ module.exports.process = async (env, tasks) => {
     const files = {};
 
     for(const type of order) {
+        if(!types.hasOwnProperty(type))
+            continue;
+
         if(!(type in types))
             throw `${type} is not a supported build task type`;