diff --git a/dist/setup/index.js b/dist/setup/index.js
index c51a5f77..b6c873b8 100644
--- a/dist/setup/index.js
+++ b/dist/setup/index.js
@@ -6112,6 +6112,9 @@ function run() {
                     yield cacheDependencies(cache, pythonVersion);
                 }
             }
+            else {
+                throw new Error('there\'s empty python-version input');
+            }
             const matchersPath = path.join(__dirname, '../..', '.github');
             core.info(`##[add-matcher]${path.join(matchersPath, 'python.json')}`);
         }
diff --git a/src/setup-python.ts b/src/setup-python.ts
index 62c76dba..3340a86e 100644
--- a/src/setup-python.ts
+++ b/src/setup-python.ts
@@ -53,6 +53,8 @@ async function run() {
       if (cache && isCacheFeatureAvailable()) {
         await cacheDependencies(cache, pythonVersion);
       }
+    } else {
+      throw new Error('there\'s empty python-version input')
     }
     const matchersPath = path.join(__dirname, '../..', '.github');
     core.info(`##[add-matcher]${path.join(matchersPath, 'python.json')}`);