diff --git a/app/build.gradle b/app/build.gradle
index c1e9e41..428b0f5 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,7 +10,7 @@ android {
         applicationId "com.uam.wmi.findmytutor"
         minSdkVersion 22
         targetSdkVersion 27
-        versionCode 56
+        versionCode 57
         versionName "1.0.0"
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
diff --git a/app/src/main/java/com/uam/wmi/findmytutor/activity/BaseActivity.java b/app/src/main/java/com/uam/wmi/findmytutor/activity/BaseActivity.java
index 6b7f595..ab0acf7 100644
--- a/app/src/main/java/com/uam/wmi/findmytutor/activity/BaseActivity.java
+++ b/app/src/main/java/com/uam/wmi/findmytutor/activity/BaseActivity.java
@@ -419,6 +419,7 @@ public abstract class BaseActivity
         sharingFragment = SharingFragment.newInstance();
         FragmentTransaction ft = getFragmentManager().beginTransaction();
         ft.replace(R.id.activity_content, sharingFragment);
+        ft.addToBackStack(null);
         ft.commit();
     }
 
@@ -428,6 +429,7 @@ public abstract class BaseActivity
         userListFragment = UsersListFragment.newInstance();
         FragmentTransaction ft = getFragmentManager().beginTransaction();
         ft.replace(R.id.activity_content, userListFragment);
+        ft.addToBackStack(null);
         ft.commit();
 
     }