diff --git a/app/src/main/java/io/legado/app/utils/MiscExtensions.kt b/app/src/main/java/io/legado/app/utils/MiscExtensions.kt
index 24bf95c9a..1f47d2af9 100644
--- a/app/src/main/java/io/legado/app/utils/MiscExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/MiscExtensions.kt
@@ -2,8 +2,8 @@ package io.legado.app.utils
 
 import com.jayway.jsonpath.ReadContext
 
-fun ReadContext.readString(path: String) = this.read(path, String::class.java)
+fun ReadContext.readString(path: String): String? = this.read(path, String::class.java)
 
-fun ReadContext.readBool(path: String) = this.read(path, Boolean::class.java)
+fun ReadContext.readBool(path: String): Boolean? = this.read(path, Boolean::class.java)
 
-fun ReadContext.readInt(path: String) = this.read(path, Int::class.java)
\ No newline at end of file
+fun ReadContext.readInt(path: String): Int? = this.read(path, Int::class.java)
\ No newline at end of file