diff --git a/index.js b/index.js
index 6fcda37..f11657c 100644
--- a/index.js
+++ b/index.js
@@ -12,7 +12,11 @@ Toolkit.run(async tools => {
   const pkg = tools.getPackageJSON()
   const event = tools.context.payload
 
-  const messages = event.commits.map(commit => commit.message + '\n' + commit.body)
+  if (!event.commits) {
+    console.log("Couldn't find any commits in this event, incrementing patch version...")
+  }
+  
+  const messages = event.commits ? event.commits.map(commit => commit.message + '\n' + commit.body) : []
 
   const commitMessage = 'version bump to'
   const isVersionBump = messages.map(message => message.toLowerCase().includes(commitMessage)).includes(true)