diff --git a/backend/src/main/kotlin/com/github/sor2171/backend/entity/DataCopy.kt b/backend/src/main/kotlin/com/github/sor2171/backend/entity/DataCopy.kt
index d4357aa..c56c742 100644
--- a/backend/src/main/kotlin/com/github/sor2171/backend/entity/DataCopy.kt
+++ b/backend/src/main/kotlin/com/github/sor2171/backend/entity/DataCopy.kt
@@ -7,6 +7,7 @@ import kotlin.reflect.full.createInstance
 import kotlin.reflect.full.declaredMemberProperties
 import kotlin.reflect.full.memberProperties
 import kotlin.reflect.jvm.isAccessible
+import kotlin.reflect.jvm.javaField
 
 interface DataCopy {
     fun <T : Any> toAnotherObject(
@@ -19,15 +20,21 @@ interface DataCopy {
         return try {
             val vo = toClass.createInstance()
             for (prop in toClass.declaredMemberProperties) {
-                @Suppress("UNCHECKED_CAST")
-                val mutableProp = prop as? KMutableProperty1<Any, Any?> ?: continue
                 val value = when {
                     sourceProps.containsKey(prop.name) -> sourceProps[prop.name]
                     otherProperties.containsKey(prop.name) -> otherProperties[prop.name]
                     else -> continue
                 }
-                mutableProp.isAccessible = true
-                mutableProp.set(vo, value)
+                @Suppress("UNCHECKED_CAST")
+                val mutableProp = prop as? KMutableProperty1<Any, Any?>
+                if (mutableProp != null) {
+                    mutableProp.isAccessible = true
+                    mutableProp.set(vo, value)
+                } else {
+                    val field = prop.javaField ?: continue
+                    field.isAccessible = true
+                    field.set(vo, value)
+                }
             }
             vo
         } catch (e: ReflectiveOperationException) {
diff --git a/backend/src/main/kotlin/com/github/sor2171/backend/utils/JwtUtils.kt b/backend/src/main/kotlin/com/github/sor2171/backend/utils/JwtUtils.kt
index a857c2d..197de01 100644
--- a/backend/src/main/kotlin/com/github/sor2171/backend/utils/JwtUtils.kt
+++ b/backend/src/main/kotlin/com/github/sor2171/backend/utils/JwtUtils.kt
@@ -25,7 +25,7 @@ class JwtUtils(
     private val algorithm: Algorithm = Algorithm.HMAC256(key)
     private val jwtVerifier: JWTVerifier = JWT.require(algorithm).build()
     private val logger = LoggerFactory.getLogger(this::class.java)
-    
+
     fun invalidateJwt(headerToken: String?): Boolean {
         val token = this.convertToToken(headerToken) ?: return false
         try {
@@ -59,10 +59,10 @@ class JwtUtils(
             val decodedJWT = jwtVerifier.verify(token)
             if (this.isInvalidToken(decodedJWT.id)) return null
             val expiresAt = decodedJWT.expiresAt
-            
+
             return if (Date().after(expiresAt)) null
             else decodedJWT
-            
+
         } catch (e: Exception) {
             logger.error("Error occurred while resolving JWT", e)
             return null
@@ -104,6 +104,8 @@ class JwtUtils(
         return cal.time
     }
 
-    fun convertToToken(headerToken: String?): String? =
-        headerToken?.replace("Bearer ", "")
+    fun convertToToken(headerToken: String?): String? {
+        val token = headerToken?.replace("Bearer ", "")?.trim()
+        return token?.takeIf { it.isNotEmpty() }
+    }
 }
\ No newline at end of file