diff --git a/index.js b/index.js
index 80ac51c74..dc6996ca3 100644
--- a/index.js
+++ b/index.js
@@ -91,7 +91,7 @@ module.exports = (app, { getRouter }) => {
           }
         }
         // check pr body
-        if (!found && autolabel.body.length > 0) {
+        if (!found && context.payload.pull_request.body != null && autolabel.body.length > 0) {
           for (const matcher of autolabel.body) {
             if (context.payload.pull_request.body.match(matcher)) {
               labels.add(autolabel.label)