diff --git a/app-server/subprojects/cross_cutting_concern/infra/persistence_model/src/main/sqldelight/club/staircrusher/infra/persistence/sqldelight/query/external_accessibility/ExternalAccessibility.sq b/app-server/subprojects/cross_cutting_concern/infra/persistence_model/src/main/sqldelight/club/staircrusher/infra/persistence/sqldelight/query/external_accessibility/ExternalAccessibility.sq
index bb4558612..057ffaac6 100644
--- a/app-server/subprojects/cross_cutting_concern/infra/persistence_model/src/main/sqldelight/club/staircrusher/infra/persistence/sqldelight/query/external_accessibility/ExternalAccessibility.sq
+++ b/app-server/subprojects/cross_cutting_concern/infra/persistence_model/src/main/sqldelight/club/staircrusher/infra/persistence/sqldelight/query/external_accessibility/ExternalAccessibility.sq
@@ -9,7 +9,7 @@ ON CONFLICT(id) DO UPDATE SET
     category = EXCLUDED.category,
     details = EXCLUDED.details,
     created_at = EXCLUDED.created_at,
-    updated_at = NULL;
+    updated_at = EXCLUDED.updated_at;
 
 removeAll:
 DELETE FROM external_accessibility;
diff --git a/app-server/subprojects/cross_cutting_concern/stdlib/src/main/kotlin/club/staircrusher/stdlib/jpa/ListToTextAttributeConverter.kt b/app-server/subprojects/cross_cutting_concern/stdlib/src/main/kotlin/club/staircrusher/stdlib/jpa/ListToTextAttributeConverter.kt
index e62d9babb..7702f4801 100644
--- a/app-server/subprojects/cross_cutting_concern/stdlib/src/main/kotlin/club/staircrusher/stdlib/jpa/ListToTextAttributeConverter.kt
+++ b/app-server/subprojects/cross_cutting_concern/stdlib/src/main/kotlin/club/staircrusher/stdlib/jpa/ListToTextAttributeConverter.kt
@@ -11,7 +11,10 @@ abstract class ListToTextAttributeConverter<E> : AttributeConverter<List<E>, Str
         return attribute.joinToString(LEGACY_DELIMITER) { convertElementToTextColumn(it) }
     }
 
-    override fun convertToEntityAttribute(column: String): List<E> {
+    override fun convertToEntityAttribute(column: String?): List<E> {
+        if (column == null) {
+            return emptyList()
+        }
         return try {
             convertJsonColumnToEntityAttribute(column)
         } catch (e: JsonProcessingException) {
diff --git a/app-server/subprojects/cross_cutting_concern/stdlib/src/unitTest/kotlin/club/staircrusher/stdlib/persistence/ListToTextAttributeConverterUT.kt b/app-server/subprojects/cross_cutting_concern/stdlib/src/unitTest/kotlin/club/staircrusher/stdlib/persistence/ListToTextAttributeConverterUT.kt
index c8f0abaca..3f438a221 100644
--- a/app-server/subprojects/cross_cutting_concern/stdlib/src/unitTest/kotlin/club/staircrusher/stdlib/persistence/ListToTextAttributeConverterUT.kt
+++ b/app-server/subprojects/cross_cutting_concern/stdlib/src/unitTest/kotlin/club/staircrusher/stdlib/persistence/ListToTextAttributeConverterUT.kt
@@ -3,6 +3,7 @@ package club.staircrusher.stdlib.persistence
 import club.staircrusher.stdlib.jpa.ListToTextAttributeConverter
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Assertions.assertNotEquals
+import org.junit.jupiter.api.Assertions.assertTrue
 import org.junit.jupiter.api.Test
 
 class ListToTextAttributeConverterUT {
@@ -32,6 +33,12 @@ class ListToTextAttributeConverterUT {
         assertEquals(attribute, serialized)
     }
 
+    @Test
+    fun `db 에 null 이 저장된 케이스도 잘 처리해준다`() {
+        val serialized = sut.convertToEntityAttribute(null)
+        assertTrue(serialized.isEmpty())
+    }
+
     // FIXME: json으로 바꾸기
 //    @Test
 //    fun `기본 동작 테스트`() {