diff --git a/app/src/main/java/com/gh/gamecenter/entity/TrackableEntity.kt b/app/src/main/java/com/gh/gamecenter/entity/TrackableEntity.kt
index ab5f3db610..8db8be294b 100644
--- a/app/src/main/java/com/gh/gamecenter/entity/TrackableEntity.kt
+++ b/app/src/main/java/com/gh/gamecenter/entity/TrackableEntity.kt
@@ -2,6 +2,6 @@ package com.gh.gamecenter.entity
 
 data class TrackableEntity(val event: String = "",
                            val key: String = "",
-                           val cancelValue: String? = "",
-                           val keyBackValue: String? = "",
+                           val cancelValue: String? = null,
+                           val keyBackValue: String? = null,
                            val logShowEvent: Boolean = false)
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