diff --git a/index.js b/index.js
index 57216c3..f616fa7 100644
--- a/index.js
+++ b/index.js
@@ -9,6 +9,10 @@ async function run() {
 
         console.log(`Searching for tag: ${tag} in ${repoInput}`);
 
+        if (!repoInput.contains('/')) {
+            throw new Error(`${repoInput} is not a valid repo`);  
+        }
+            
         // Get owner and repo from context of payload that triggered the action
         const [ owner, ...repository ] = repoInput.split('/');
         const repo = repository.join('/');
@@ -38,4 +42,4 @@ async function run() {
     }
 }
 
-run();
\ No newline at end of file
+run();