diff --git a/app/build.gradle b/app/build.gradle
index 7f3fa56..0642544 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -11,8 +11,8 @@ android {
         applicationId "com.gomsang.lab.nearmask"
         minSdkVersion 22
         targetSdkVersion 29
-        versionCode 4
-        versionName "1.3"
+        versionCode 5
+        versionName "1.4"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
diff --git a/app/src/main/java/com/gomsang/lab/publicmask/libs/http/mask/Mask.kt b/app/src/main/java/com/gomsang/lab/publicmask/libs/http/mask/Mask.kt
index a075e11..27b54e5 100644
--- a/app/src/main/java/com/gomsang/lab/publicmask/libs/http/mask/Mask.kt
+++ b/app/src/main/java/com/gomsang/lab/publicmask/libs/http/mask/Mask.kt
@@ -1,17 +1,60 @@
 package com.gomsang.lab.publicmask.libs.http.mask
 
 import com.gomsang.lab.publicmask.libs.constants.WebAddresses
-import com.gomsang.lab.publicmask.libs.http.kakao.KakaoAPI
+import com.google.gson.Gson
+import com.google.gson.GsonBuilder
+import com.google.gson.TypeAdapter
+import com.google.gson.TypeAdapterFactory
+import com.google.gson.reflect.TypeToken
+import com.google.gson.stream.JsonReader
+import com.google.gson.stream.JsonToken
+import com.google.gson.stream.JsonWriter
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
+import java.io.IOException
+
 
 class Mask {
     val api: MaskAPI
 
     constructor() {
+
+        class StringAdapter : TypeAdapter<String?>() {
+            @Throws(IOException::class)
+            override fun read(reader: JsonReader): String {
+                if (reader.peek() === JsonToken.NULL) {
+                    reader.nextNull()
+                    return ""
+                }
+                return reader.nextString()
+            }
+
+            @Throws(IOException::class)
+            override fun write(writer: JsonWriter, value: String?) {
+                if (value == null) {
+                    writer.nullValue()
+                    return
+                }
+                writer.value(value)
+            }
+        }
+
+
+        class NullStringToEmptyAdapterFactory<T> : TypeAdapterFactory {
+            override fun <T> create(gson: Gson, type: TypeToken<T>): TypeAdapter<T>? {
+                val rawType = type.rawType as Class<T>
+                return if (rawType != String::class.java) {
+                    null
+                } else StringAdapter() as TypeAdapter<T>
+            }
+        }
+
+        val gson =
+            GsonBuilder().registerTypeAdapterFactory(NullStringToEmptyAdapterFactory<Any>()).create()
+
         val retrofit: Retrofit = Retrofit.Builder()
             .baseUrl(WebAddresses.URL_MASK_API)
-            .addConverterFactory(GsonConverterFactory.create())
+            .addConverterFactory(GsonConverterFactory.create(gson))
             .build()
         api = retrofit.create<MaskAPI>(MaskAPI::class.java)
     }
diff --git a/app/src/main/java/com/gomsang/lab/publicmask/libs/util/StatUtil.kt b/app/src/main/java/com/gomsang/lab/publicmask/libs/util/StatUtil.kt
index 60c6ab7..e582510 100644
--- a/app/src/main/java/com/gomsang/lab/publicmask/libs/util/StatUtil.kt
+++ b/app/src/main/java/com/gomsang/lab/publicmask/libs/util/StatUtil.kt
@@ -8,7 +8,7 @@ object StatUtil {
             "few" -> return "1+"
             "empty" -> return "재고소진"
         }
-        return "error"
+        return "에러"
     }
     fun convertStatToDetailString(stat : String): String{
         when (stat) {
@@ -17,7 +17,7 @@ object StatUtil {
             "few" -> return "1개 이상 30개 미만"
             "empty" -> return "재고소진"
         }
-        return "error"
+        return "에러"
     }
 
     fun convertTypeToString(type : String): String {
diff --git a/app/src/main/java/com/gomsang/lab/publicmask/ui/map/MapFragment.kt b/app/src/main/java/com/gomsang/lab/publicmask/ui/map/MapFragment.kt
index 5081552..c015de5 100644
--- a/app/src/main/java/com/gomsang/lab/publicmask/ui/map/MapFragment.kt
+++ b/app/src/main/java/com/gomsang/lab/publicmask/ui/map/MapFragment.kt
@@ -66,6 +66,7 @@ class MapFragment : BaseFragment<FragmentMapBinding, MapViewModel>(), OnMapReady
 
             stocks.forEach { stock ->
                 Logger.log("CAMERA_CHANGED", Gson().toJson(stock))
+                if (stock.remainStat == null) stock.remainStat = ""
                 val infoWindow = InfoWindow()
                 infoWindow.adapter = object : InfoWindow.DefaultTextAdapter(context!!) {
                     override fun getText(infoWindow: InfoWindow): CharSequence {
@@ -88,6 +89,9 @@ class MapFragment : BaseFragment<FragmentMapBinding, MapViewModel>(), OnMapReady
                         marker.icon = MarkerIcons.RED
                     "empty" ->
                         marker.icon = MarkerIcons.GRAY
+                    else -> {
+                        marker.icon = MarkerIcons.GRAY
+                    }
                 }
                 marker.map = map
                 infoWindow.open(marker)
diff --git a/app/src/main/java/com/gomsang/lab/publicmask/ui/search/SearchFragment.kt b/app/src/main/java/com/gomsang/lab/publicmask/ui/search/SearchFragment.kt
index 50623ba..9697218 100644
--- a/app/src/main/java/com/gomsang/lab/publicmask/ui/search/SearchFragment.kt
+++ b/app/src/main/java/com/gomsang/lab/publicmask/ui/search/SearchFragment.kt
@@ -97,7 +97,7 @@ class SearchFragment : BaseFragment<FragmentSearchBinding, SearchViewModel>() {
             }
 
             override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
-                if (!viewModel.latestSearchKeyword.equals(s.toString())) {
+                if (viewModel.latestSearchKeyword != s.toString()) {
                     layoutSwitch(false)
                 }
             }