diff --git a/src/ssn/findReleasePath.ts b/src/ssn/findReleasePath.ts
index d0d5f93..6850f86 100644
--- a/src/ssn/findReleasePath.ts
+++ b/src/ssn/findReleasePath.ts
@@ -3,6 +3,10 @@ import verifyProductName from '../ssn/verify/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: Product, to: number}) {
+  if (releaseTo < 0) {
+    return [];
+  }
+
   //The launcher (patcher, patcher2014, patcher2017) is always installing from -1, never from a previous version
   if (product.startsWith('patcher')) {
     return [-1];