1 files changed, 4 insertions, 1 deletions
diff --git a/lib/template/index.js b/lib/template/index.js
index 8a52392..fc7603d 100644
--- a/lib/template/index.js
+++ b/lib/template/index.js
@@ -146,12 +146,15 @@ TemplateEngine.prototype.addBlock = function(name, block) {
     block = _.defaults(block || {}, {
         shortcuts: [],
         end: 'end'+name,
-        process: _.identity,
         blocks: []
     });
 
     extName = blockExtName(name);
 
+    if (!block.process) {
+        throw new Error('Invalid block "' + name + '", it should have a "process" method');
+    }
+
     if (this.hasBlock(name) && !defaultBlocks[name]) {
         this.log.warn.ln('conflict in blocks, "'+name+'" is already defined');
     }