diff --git a/src/lib/guardrails/promptInjection.ts b/src/lib/guardrails/promptInjection.ts
index eed2d21709..b2ca2030b1 100644
--- a/src/lib/guardrails/promptInjection.ts
+++ b/src/lib/guardrails/promptInjection.ts
@@ -111,7 +111,7 @@ function shouldBlock(detections: Detection[], threshold: "low" | "medium" | "hig
 }
 
 function getLogger(options: PromptInjectionGuardrailOptions, context: GuardrailContext) {
-  return options.logger || context.log || console;
+  return options.logger ?? context.log ?? null;
 }
 
 function emitGuardrailLog(
diff --git a/src/middleware/promptInjectionGuard.ts b/src/middleware/promptInjectionGuard.ts
index be2e149479..727e005c89 100644
--- a/src/middleware/promptInjectionGuard.ts
+++ b/src/middleware/promptInjectionGuard.ts
@@ -33,7 +33,7 @@ export function createInjectionGuard(options: PromptInjectionGuardrailOptions =
 
     const decision = evaluatePromptInjection(body, options, {
       disabledGuardrails: resolveDisabledGuardrails({ body }),
-      log: options.logger || console,
+      log: options.logger ?? null,
     });
     return {
       blocked: decision.blocked,