diff --git a/src/services/rngService.ts b/src/services/rngService.ts
index c56837bc..bb9028b2 100644
--- a/src/services/rngService.ts
+++ b/src/services/rngService.ts
@@ -99,6 +99,9 @@ export class CRng {
     randomInt(min: number, max: number): number {
         const diff = max - min;
         if (diff != 0) {
+            if (diff < 0) {
+                throw new Error(`max must be greater than min`);
+            }
             if (diff > 0x3fffffff) {
                 throw new Error(`insufficient entropy`);
             }
diff --git a/src/services/serversideVendorsService.ts b/src/services/serversideVendorsService.ts
index 7d219eec..62a4a0e0 100644
--- a/src/services/serversideVendorsService.ts
+++ b/src/services/serversideVendorsService.ts
@@ -246,7 +246,8 @@ const generateVendorManifest = (vendorInfo: IGeneratableVendorInfo): IVendorMani
                             .toString(16)
                             .padStart(8, "0") +
                         vendorInfo._id.$oid.substring(8, 16) +
-                        ((rng.randomInt(0, 0xffff) << 16) | rng.randomInt(0, 0xffff)).toString(16).padStart(8, "0")
+                        rng.randomInt(0, 0xffff).toString(16).padStart(4, "0") +
+                        rng.randomInt(0, 0xffff).toString(16).padStart(4, "0")
                 }
             };
             if (rawItem.numRandomItemPrices) {