diff --git a/android/src/main/java/com/toyberman/fingerprintChange/RNFingerprintChangeModule.java b/android/src/main/java/com/toyberman/fingerprintChange/RNFingerprintChangeModule.java
index 8c072e5..1dc7a2b 100644
--- a/android/src/main/java/com/toyberman/fingerprintChange/RNFingerprintChangeModule.java
+++ b/android/src/main/java/com/toyberman/fingerprintChange/RNFingerprintChangeModule.java
@@ -80,12 +80,12 @@ public void hasFingerPrintChanged(Callback errorCallback, Callback successCallba
             // last saved key
             int lastKeyId = spref.getInt(LAST_KEY_ID, -1);
             if (lastKeyId != fingersId && lastKeyId!= -1) {
-                spref.edit().putInt(LAST_KEY_ID, fingersId).apply();
                 successCallback.invoke(true);
-
             } else {
                 successCallback.invoke(false);
             }
+            if(lastKeyId==-1)
+             spref.edit().putInt(LAST_KEY_ID, fingersId).apply();
         } catch (NoSuchMethodException | IllegalAccessException | InvocationTargetException | ClassNotFoundException e) {
             successCallback.invoke(false);
         }
@@ -120,4 +120,4 @@ public String getName() {
         return "RNFingerprintChange";
     }
 
-}
\ No newline at end of file
+}