diff --git a/lib/plugins/blocks.js b/lib/plugins/blocks.js
index e5efb7634..5d396516c 100644
--- a/lib/plugins/blocks.js
+++ b/lib/plugins/blocks.js
@@ -75,9 +75,10 @@ function inject (bot, { version }) {
         }
       }
     }
+    return null
 
     function isMatchingType (block) {
-      return options.matching.indexOf(block.type) >= 0
+      return block === null ? false : options.matching.indexOf(block.type) >= 0
     }
   }