diff --git a/dist/index.js b/dist/index.js
index 221f1a3..105fa40 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -71,12 +71,17 @@ exports.getDeniedLicenseChanges = void 0;
 /**
  * Loops through a list of changes, filtering and returning the
  * ones that don't conform to the licenses allow/deny lists.
+ *
+ * Keep in mind that we don't let users specify both an allow and a deny
+ * list in their config files, so this code works under the assumption that
+ * one of the two list parameters will be empty. If both lists are provided,
+ * we will ignore the deny list.
  * @param {Change[]} changes The list of changes to filter.
  * @param { { allow?: string[], deny?: string[]}} licenses An object with `allow`/`deny` keys, each containing a list of licenses.
  * @returns {Array<Change} The list of denied changes.
  */
 function getDeniedLicenseChanges(changes, licenses) {
-    let { allow = null, deny = null } = licenses;
+    let { allow, deny } = licenses;
     let disallowed = [];
     for (const change of changes) {
         let license = change.license;
@@ -84,12 +89,12 @@ function getDeniedLicenseChanges(changes, licenses) {
         if (license === null) {
             continue;
         }
-        if (allow !== null) {
+        if (allow !== undefined) {
             if (!allow.includes(license)) {
                 disallowed.push(change);
             }
         }
-        else if (deny !== null) {
+        else if (deny !== undefined) {
             if (deny.includes(license)) {
                 disallowed.push(change);
             }