diff --git a/frontend/src/ts/config-validation.ts b/frontend/src/ts/config-validation.ts
index e47ebf705..3879c7585 100644
--- a/frontend/src/ts/config-validation.ts
+++ b/frontend/src/ts/config-validation.ts
@@ -62,7 +62,7 @@ export function isConfigValueValid(
         break;
 
       case "number":
-        if (typeof val === "number") isValid = true;
+        if (typeof val === "number" && !isNaN(val)) isValid = true;
         break;
 
       case "numberArray":