diff --git a/.gitignore b/.gitignore
index 2946d00bdf7b..e2a50cb343d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -132,4 +132,4 @@ frontend/static/webfonts-preview
 .turbo
 frontend/.env.sentry-build-plugin
 .claude/worktrees
-1024MiB
\ No newline at end of file
+1024MiB
diff --git a/frontend/src/ts/utils/json-data.ts b/frontend/src/ts/utils/json-data.ts
index 3151e9ce5daa..0437db6dbd37 100644
--- a/frontend/src/ts/utils/json-data.ts
+++ b/frontend/src/ts/utils/json-data.ts
@@ -52,7 +52,7 @@ export function memoizeAsync<P, Args extends unknown[], R>(
     const key = getKey ? getKey(...args) : (args[0] as P);
 
     const cached = cache.get(key);
-    if (cached) {
+    if (cached !== undefined) {
       return cached;
     }
 
diff --git a/packages/util/src/numbers.ts b/packages/util/src/numbers.ts
index ce29b3cb313e..347ce5925ac8 100644
--- a/packages/util/src/numbers.ts
+++ b/packages/util/src/numbers.ts
@@ -46,7 +46,8 @@ export function stdDev(array: number[]): number {
     const n = array.length;
     const meanValue = mean(array);
     return Math.sqrt(
-      array.map((x) => Math.pow(x - meanValue, 2)).reduce((a, b) => a + b) / n,
+      array.map((x) => Math.pow(x - meanValue, 2)).reduce((a, b) => a + b, 0) /
+        n,
     );
   } catch (e) {
     return 0;