diff --git a/api/api-core/src/main/kotlin/co/nilin/opex/api/core/inout/UserWebConfig.kt b/api/api-core/src/main/kotlin/co/nilin/opex/api/core/inout/UserWebConfig.kt
index 08b920bbc..c30dc0afe 100644
--- a/api/api-core/src/main/kotlin/co/nilin/opex/api/core/inout/UserWebConfig.kt
+++ b/api/api-core/src/main/kotlin/co/nilin/opex/api/core/inout/UserWebConfig.kt
@@ -7,5 +7,5 @@ import co.nilin.opex.common.data.UserLanguage
 data class UserWebConfig(
     var theme: Theme,
     var language: UserLanguage,
-    var calender: CalenderType
+    var calender: CalenderType? = null
 )
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