diff --git a/index.js b/index.js
index cd092623f..ff62fd6a7 100644
--- a/index.js
+++ b/index.js
@@ -160,7 +160,7 @@ class ServerlessPlugin {
                         type: 'string',
                     },
                     path: {
-                        usage: 'Path to JSON or YAML file holding input data (use either this or --data)',
+                        usage: 'Path to JSON file holding input data (use either this or --data)',
                         shortcut: 'p',
                         type: 'string',
                     },
diff --git a/plugin/layers.js b/plugin/layers.js
index f0d9c45c8..0d91d9898 100644
--- a/plugin/layers.js
+++ b/plugin/layers.js
@@ -23,7 +23,8 @@ function listLayers(serverless, log) {
 }
 
 function padString(str, length) {
-    return str.padEnd(length, ' ');
+    // The value may be a number (layer versions are numbers in layers.json)
+    return String(str).padEnd(length, ' ');
 }
 
 module.exports = {listLayers};