fix: variation total count handle missing value

Author: capJavert

__tests__/common/number.ts

@@ -129,4 +129,15 @@ describe('applyDeterministicVariation', () => {
     // Empty seed should return original value without variation
     expect(result).toBe(baseValue);
   });
+
+  it('should handle falsy value', () => {
+    const result = applyDeterministicVariation({
+      value: null as unknown as number,
+      seed: '',
+      maxVariationPercent: 7.6,
+    });
+
+    // Empty seed should return original value without variation
+    expect(result).toBe(0);
+  });
 });

src/common/number.ts

@@ -1,3 +1,5 @@
+import { isNullOrUndefined } from './object';
+
 export function largeNumberFormat(value: number): string | null {
   if (typeof value !== 'number') {
     return null;
@@ -81,6 +83,10 @@ export const applyDeterministicVariation = ({
   seed: string;
   maxVariationPercent: number;
 }): number => {
+  if (isNullOrUndefined(value)) {
+    return 0;
+  }
+
   if (!seed) {
     return value;
   }