diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index 33745c7..aa9b387 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -1,4 +1,4 @@
-name: Build and test the aws jslib against a Localstack instance
+name: Lint the aws jslib
 on:
     # Enables running the workflow manually from the Actions tab
     workflow_dispatch:
diff --git a/.gitignore b/.gitignore
index 7273e94..9ff5785 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules/
 /volume
 dist/
+.DS_Store
diff --git a/package-lock.json b/package-lock.json
index 35dc1e8..eafce00 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "k6-jslib-aws",
-    "version": "0.12.0",
+    "version": "0.12.3",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "k6-jslib-aws",
-            "version": "0.12.0",
+            "version": "0.12.3",
             "license": "MIT",
             "devDependencies": {
                 "@babel/core": "^7.4.4",
diff --git a/src/internal/signature.ts b/src/internal/signature.ts
index 02bcb64..79407d3 100644
--- a/src/internal/signature.ts
+++ b/src/internal/signature.ts
@@ -274,7 +274,7 @@ export class SignatureV4 {
         if (request.path) {
             // Ensure there is a trailing slash at the end of the URL
             // so that appending the path does not result in a malformed URL.
-            url = url.endsWith('/') ? url : url + '/'
+            url = url?.endsWith('/') ? url : url + '/'
 
             // Append the path to the URL
             url += request.path