diff --git a/.gitignore b/.gitignore
index 8fa326f97..f45220d4f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -125,3 +125,6 @@ roots/
 .python-version
 build/
 .mise.toml
+
+# Ignore IntelliJ IDEA module file
+cdxgen.iml
\ No newline at end of file
diff --git a/utils.js b/utils.js
index 191fe894f..0373544d0 100644
--- a/utils.js
+++ b/utils.js
@@ -512,7 +512,7 @@ export function getLicenses(pkg) {
       license = [license];
     }
     return adjustLicenseInformation(
-      license.map((l) => {
+        license.filter((l) => l !== undefined).map((l) => {
         let licenseContent = {};
         if (typeof l === "string" || l instanceof String) {
           if (
diff --git a/utils.test.js b/utils.test.js
index 574000dc7..83d55795e 100644
--- a/utils.test.js
+++ b/utils.test.js
@@ -2398,6 +2398,26 @@ test("get licenses", () => {
       expression: "GPL-3.0-only WITH Classpath-exception-2.0",
     },
   ]);
+
+  licenses = getLicenses({
+    license: [
+      "GPL-3.0-only WITH Classpath-exception-2.0",
+      "NOT-GPL-2.1+"
+    ]
+  });
+  expect(licenses).toEqual([
+    {
+      expression: "GPL-3.0-only WITH Classpath-exception-2.0",
+    },
+    {
+      expression: "NOT-GPL-2.1+",
+    }
+  ]);
+
+  licenses = getLicenses({
+    license: undefined,
+  });
+  expect(licenses).toEqual(undefined);
 });
 
 test("parsePkgJson", async () => {