diff --git a/project/src/helpers/ItemHelper.ts b/project/src/helpers/ItemHelper.ts
index efa8fc5d..4929afde 100644
--- a/project/src/helpers/ItemHelper.ts
+++ b/project/src/helpers/ItemHelper.ts
@@ -1105,7 +1105,13 @@ export class ItemHelper
     protected drawAmmoTpl(caliber: string, staticAmmoDist: Record<string, IStaticAmmoDetails[]>): string
     {
         const ammoArray = new ProbabilityObjectArray<string>(this.mathUtil, this.jsonUtil);
-        for (const icd of staticAmmoDist[caliber])
+        const ammos = staticAmmoDist[caliber];
+        if (!ammos)
+        {
+            this.logger.error(`missing caliber data for: ${caliber}`);
+        }
+
+        for (const icd of ammos)
         {
             ammoArray.push(new ProbabilityObject(icd.tpl, icd.relativeProbability));
         }