diff --git a/src/bun.js/bindings/ZigGlobalObject.cpp b/src/bun.js/bindings/ZigGlobalObject.cpp
index 64d6ccc0d2..36720bdec1 100644
--- a/src/bun.js/bindings/ZigGlobalObject.cpp
+++ b/src/bun.js/bindings/ZigGlobalObject.cpp
@@ -1551,10 +1551,14 @@ JSC_DEFINE_HOST_FUNCTION(functionQueueMicrotask,
     auto function = globalObject->performMicrotaskFunction();
 #if ASSERT_ENABLED
     ASSERT_WITH_MESSAGE(function, "Invalid microtask function");
-    ASSERT_WITH_MESSAGE(asyncContext.isEmpty(), "Invalid microtask context");
-    ASSERT_WITH_MESSAGE(callback.isEmpty(), "Invalid microtask callback");
+    ASSERT_WITH_MESSAGE(!asyncContext.isEmpty(), "Invalid microtask context");
+    ASSERT_WITH_MESSAGE(!callback.isEmpty(), "Invalid microtask callback");
 #endif
 
+    if (asyncContext.isEmpty()) {
+        asyncContext = JSC::jsUndefined();
+    }
+
     // This is a JSC builtin function
     lexicalGlobalObject->queueMicrotask(function, callback, asyncContext,
         JSC::jsUndefined(), JSC::jsUndefined());
diff --git a/src/bun.js/bindings/bindings.cpp b/src/bun.js/bindings/bindings.cpp
index 4220f04d46..750704fedc 100644
--- a/src/bun.js/bindings/bindings.cpp
+++ b/src/bun.js/bindings/bindings.cpp
@@ -3471,9 +3471,9 @@ void JSC__JSPromise__rejectOnNextTickWithHandled(JSC::JSPromise* promise, JSC::J
 
 #if ASSERT_ENABLED
         ASSERT_WITH_MESSAGE(microtaskFunction, "Invalid microtask function");
-        ASSERT_WITH_MESSAGE(asyncContext.isEmpty(), "Invalid microtask context");
+        ASSERT_WITH_MESSAGE(!asyncContext.isEmpty(), "Invalid microtask context");
         ASSERT_WITH_MESSAGE(rejectPromiseFunction, "Invalid microtask callback");
-        ASSERT_WITH_MESSAGE(value.isEmpty(), "Invalid microtask value");
+        ASSERT_WITH_MESSAGE(!value.isEmpty(), "Invalid microtask value");
 #endif
 
         if (asyncContext.isEmpty()) {