diff --git a/src/main/java/com/msb/model/GameModel.java b/src/main/java/com/msb/model/GameModel.java
index ae11f28..5c33e0c 100644
--- a/src/main/java/com/msb/model/GameModel.java
+++ b/src/main/java/com/msb/model/GameModel.java
@@ -138,10 +138,12 @@ public class GameModel {
         } catch (IOException e) {
             e.printStackTrace();
         } finally {
-            try {
-                oos.close();
-            } catch (IOException e) {
-                e.printStackTrace();
+            if(null != oos) {
+                try {
+                    oos.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
             }
         }
     }
@@ -156,13 +158,14 @@ public class GameModel {
         } catch (IOException | ClassNotFoundException e) {
             e.printStackTrace();
         } finally {
-            try {
-                ois.close();
-            } catch (IOException e) {
-                e.printStackTrace();
+            if(null != ois) {
+                try {
+                    ois.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
             }
         }
-
     }
 
 }