diff --git a/CardboardMpo/build.gradle b/CardboardMpo/build.gradle
index 066f63d..b25c312 100644
--- a/CardboardMpo/build.gradle
+++ b/CardboardMpo/build.gradle
@@ -8,15 +8,15 @@ android {
     defaultConfig {
         minSdkVersion 16
         targetSdkVersion 23
-        versionCode 8
-        versionName "1.4"
+        versionCode 9
+        versionName "1.5"
     }
 
     lintOptions.abortOnError false
 
     buildTypes {
         release {
-            minifyEnabled true
+            minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-android.txt')
         }
     }
diff --git a/CardboardMpo/src/main/java/com/dmitrybrant/android/cardboardmpo/MainActivity.java b/CardboardMpo/src/main/java/com/dmitrybrant/android/cardboardmpo/MainActivity.java
index 4529ca0..492f80c 100644
--- a/CardboardMpo/src/main/java/com/dmitrybrant/android/cardboardmpo/MainActivity.java
+++ b/CardboardMpo/src/main/java/com/dmitrybrant/android/cardboardmpo/MainActivity.java
@@ -225,6 +225,9 @@ public MainFindTask() {
 
         @Override
         protected void onPostExecute(List<File> results) {
+            if (isDestroyed()) {
+                return;
+            }
             mpoFileList.clear();
             setProgress(false);
             if (results.size() == 0) {
@@ -275,6 +278,9 @@ protected void onProgressUpdate(Integer... progress) {
 
         @Override
         protected void onPostExecute(List<Long> results) {
+            if (isDestroyed()) {
+                return;
+            }
             if (bmpLeft == null || bmpRight == null) {
                 setStatus(true, getString(R.string.status_error_load));
             } else {