diff --git a/packages/universal/debug/src/call-stack/debug/stack.ts b/packages/universal/debug/src/call-stack/debug/stack.ts
index b5a125bf..df033cb0 100644
--- a/packages/universal/debug/src/call-stack/debug/stack.ts
+++ b/packages/universal/debug/src/call-stack/debug/stack.ts
@@ -33,7 +33,7 @@ export function callerStack(
       "An error created in the internals of Stack.create",
     ).stack;
 
-    verify(stack, hasType("string"));
+    verify?.(stack, hasType("string"));
     return callStack(stack)?.slice(internal + CALLER);
   }
 }
diff --git a/packages/universal/verify/index.ts b/packages/universal/verify/index.ts
index 47415c63..61324aca 100644
--- a/packages/universal/verify/index.ts
+++ b/packages/universal/verify/index.ts
@@ -30,6 +30,6 @@ export const expected: typeof expectedDev = import.meta.env.DEV ? expectedDev :
 export const hasType: typeof hasTypeDev = import.meta.env.DEV ? hasTypeDev : (noop as typeof hasTypeDev)
 export const isOneOf: typeof isOneOfDev = import.meta.env.DEV ? isOneOfDev : (noop as typeof isOneOfDev)
 
-export const verify: VerifyFn | null = import.meta.env.DEV
+export const verify: VerifyFn = import.meta.env.DEV
   ? verifyDev
-  : null;
+  : null as unknown as VerifyFn;