diff --git a/src/ssn/releasePaths.ts b/src/ssn/releasePaths.ts
index 530a578..f24b6f3 100644
--- a/src/ssn/releasePaths.ts
+++ b/src/ssn/releasePaths.ts
@@ -1,5 +1,8 @@
+import { Product } from '../interfaces/ISettings';
+import verifyProductName from '../ssn/verifyProductName';
+
 /** For the given release in the given product, returns from which releases we can patch to this release. */
-function getFroms({ product, to: releaseTo}: {product: string, to: number}) {
+function getFroms({ product, to: releaseTo}: {product: Product, to: number}) {
   //The launcher (patcher, patcher2014, patcher2017) is always installing from -1, never from a previous version
   if (product.startsWith('patcher')) {
     return [-1];
@@ -47,8 +50,16 @@ function getFroms({ product, to: releaseTo}: {product: string, to: number}) {
  * Does not actually look at the manifest.xml file but theorizes on possible patches based on the usually created patches, allowing
  * us to find release pathes for products that have not been released yet.
  */
-export default function findReleasePath({ product, from, to}: {product: string, from: number, to: number}): Array<[number, number]> {
+export default function findReleasePath({ product, from, to}: {product: Product, from: number, to: number}): Array<[number, number]> {
+  //Verify function arguments
+  if (!verifyProductName(product)) {
+    throw new Error(`"${product}" is not a valid product.`);
+  }
+
   //We assume that "from < to" is true for all patches
+  if (from > to) {
+    throw new Error('Cannot patch backwards; to must be greater than from.');
+  }
 
   const froms = getFroms({ product, to });