diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index db47d158..5d5eeb8b 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -88,14 +88,22 @@ public class FileManagerImpl implements FileManager {
 
     @Override
     public boolean isReadable() {
-        File file = this.path.toFile();
-        return file.canRead();
+        if (this.isExist()) {
+            File file = this.path.toFile();
+            return file.canRead();
+        } else {
+            return false;
+        }
     }
 
     @Override
     public boolean isWritable() {
-        File file = this.path.toFile();
-        return file.canWrite();
+        if (this.isExist()) {
+            File file = this.path.toFile();
+            return file.canWrite();
+        } else {
+            return false;
+        }
     }
 
     @Override