diff --git a/fpdfsdk/javascript/Field.cpp b/fpdfsdk/javascript/Field.cpp
index 92b473b..f37b3d4 100644
--- a/fpdfsdk/javascript/Field.cpp
+++ b/fpdfsdk/javascript/Field.cpp
@@ -2835,7 +2835,8 @@
 
   v8::Local<v8::Object> pObj =
       pRuntime->NewFxDynamicObj(CJS_Icon::g_nObjDefnID);
-  ASSERT(pObj.IsEmpty() == false);
+  if (pObj.IsEmpty())
+    return false;
 
   CJS_Icon* pJS_Icon = static_cast<CJS_Icon*>(pRuntime->GetObjectPrivate(pObj));
   vRet = CJS_Value(pRuntime, pJS_Icon);
@@ -2966,7 +2967,8 @@
   for (const auto& pStr : swSort) {
     v8::Local<v8::Object> pObj =
         pRuntime->NewFxDynamicObj(CJS_Field::g_nObjDefnID);
-    ASSERT(!pObj.IsEmpty());
+    if (pObj.IsEmpty())
+      return false;
 
     CJS_Field* pJSField =
         static_cast<CJS_Field*>(pRuntime->GetObjectPrivate(pObj));