diff --git a/app/src/main/java/io/legado/app/help/http/CoroutinesCallAdapterFactory.kt b/app/src/main/java/io/legado/app/help/http/CoroutinesCallAdapterFactory.kt
index 5489275ea..70391773a 100644
--- a/app/src/main/java/io/legado/app/help/http/CoroutinesCallAdapterFactory.kt
+++ b/app/src/main/java/io/legado/app/help/http/CoroutinesCallAdapterFactory.kt
@@ -21,20 +21,12 @@ class CoroutinesCallAdapterFactory private constructor() : CallAdapter.Factory()
         if (Deferred::class.java != getRawType(returnType)) {
             return null
         }
-        if (returnType !is ParameterizedType) {
-            throw IllegalStateException(
-                "Deferred return type must be parameterized as Deferred<Foo> or Deferred<out Foo>"
-            )
-        }
+        check(returnType is ParameterizedType) { "Deferred return type must be parameterized as Deferred<Foo> or Deferred<out Foo>" }
         val responseType = getParameterUpperBound(0, returnType)
 
         val rawDeferredType = getRawType(responseType)
         return if (rawDeferredType == Response::class.java) {
-            if (responseType !is ParameterizedType) {
-                throw IllegalStateException(
-                    "Response must be parameterized as Response<Foo> or Response<out Foo>"
-                )
-            }
+            check(responseType is ParameterizedType) { "Response must be parameterized as Response<Foo> or Response<out Foo>" }
             ResponseCallAdapter<Any>(
                 getParameterUpperBound(
                     0,