diff --git a/app/build.gradle b/app/build.gradle
index e2c5c58e..915bac3e 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -46,7 +46,7 @@ ext {
 }
 
 dependencies {
-    implementation 'com.simplemobiletools:commons:3.0.20'
+    implementation 'com.simplemobiletools:commons:3.0.22'
 
     debugImplementation "com.squareup.leakcanary:leakcanary-android:$leakCanaryVersion"
     releaseImplementation "com.squareup.leakcanary:leakcanary-android-no-op:$leakCanaryVersion"
diff --git a/app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt b/app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt
index 15312dab..d8f84661 100644
--- a/app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt
+++ b/app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt
@@ -109,6 +109,7 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         super.onDestroy()
         mPreview?.releaseCamera()
         mPreview?.mActivity = null
+        mPreview = null
     }
 
     private fun initVariables() {