diff --git a/app/src/main/java/com/osfans/trime/data/schema/Schema.kt b/app/src/main/java/com/osfans/trime/data/schema/Schema.kt
index edfde4406c..afc30f45ef 100644
--- a/app/src/main/java/com/osfans/trime/data/schema/Schema.kt
+++ b/app/src/main/java/com/osfans/trime/data/schema/Schema.kt
@@ -3,9 +3,6 @@ package com.osfans.trime.data.schema
 import com.osfans.trime.util.config.Config
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.Transient
-import kotlinx.serialization.builtins.ListSerializer
-import kotlinx.serialization.builtins.MapSerializer
-import kotlinx.serialization.builtins.serializer
 
 class Schema(schemaId: String = ".default") {
     private val config =
@@ -17,11 +14,9 @@ class Schema(schemaId: String = ".default") {
 
     val switches get() =
         config?.getList("switches")
-            ?.decode(ListSerializer(Switch.serializer()))
 
     val symbols get() =
         config?.getMap("punctuator/symbols")
-            ?.decode(MapSerializer(String.serializer(), ListSerializer(String.serializer())))
 
     val alphabet get() = config?.getString("speller/alphabet")
 
diff --git a/app/src/main/java/com/osfans/trime/data/schema/SchemaManager.kt b/app/src/main/java/com/osfans/trime/data/schema/SchemaManager.kt
index 17a2a30ab3..2ccec7c9f6 100644
--- a/app/src/main/java/com/osfans/trime/data/schema/SchemaManager.kt
+++ b/app/src/main/java/com/osfans/trime/data/schema/SchemaManager.kt
@@ -3,6 +3,7 @@ package com.osfans.trime.data.schema
 import com.osfans.trime.core.CandidateListItem
 import com.osfans.trime.core.Rime
 import com.osfans.trime.data.AppPrefs
+import kotlinx.serialization.builtins.ListSerializer
 
 object SchemaManager {
     private lateinit var currentSchema: Schema
@@ -16,6 +17,7 @@ object SchemaManager {
     fun init(schemaId: String) {
         currentSchema = runCatching { Schema(schemaId) }.getOrDefault(defaultSchema)
         visibleSwitches = currentSchema.switches
+            ?.decode(ListSerializer(Schema.Switch.serializer()))
             ?.filter { !it.states.isNullOrEmpty() } ?: listOf() // 剔除没有 states 条目项的值，它们不作为开关使用
         updateSwitchOptions()
     }
diff --git a/app/src/main/java/com/osfans/trime/ime/symbol/TabManager.kt b/app/src/main/java/com/osfans/trime/ime/symbol/TabManager.kt
index 44181a781b..65b3403682 100644
--- a/app/src/main/java/com/osfans/trime/ime/symbol/TabManager.kt
+++ b/app/src/main/java/com/osfans/trime/ime/symbol/TabManager.kt
@@ -111,7 +111,7 @@ object TabManager {
 
             val symbolMaps = SchemaManager.getActiveSchema().symbols
             for ((key, value) in p) {
-                if (symbolMaps != null && symbolMaps.containsKey(value)) {
+                if (symbolMaps?.containsKey(value) == true) {
                     keysList.add(SimpleKeyBean(value, key))
                 }
             }