Fixes #144. Added some logs as I'm not sure if it's a good solution.

app/src/main/java/apps/amine/bou/readerforselfoss/ReaderActivity.kt

@@ -25,8 +25,6 @@ import retrofit2.Response
 
 class ReaderActivity : AppCompatActivity() {
 
-    private lateinit var allItems: ArrayList<Item>
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         Scoop.getInstance().apply(this)
@@ -43,6 +41,18 @@ class ReaderActivity : AppCompatActivity() {
         val userIdentifier = sharedPref.getString("unique_id", "")
         val markOnScroll = sharedPref.getBoolean("mark_on_scroll", false)
 
+        if (allItems.isEmpty()) {
+            Crashlytics.setUserIdentifier(userIdentifier)
+            Crashlytics.log(
+                    100,
+                    "READER_ITEMS_EMPTY",
+                    "Items empty when trying to open the Article Reader. Was (static) companion object field set ?"
+            )
+            Crashlytics.logException(Exception("Empty items on Reader Activity."))
+
+            finish()
+        }
+
         val api = SelfossApi(
                 this,
                 this@ReaderActivity,
@@ -50,7 +60,6 @@ class ReaderActivity : AppCompatActivity() {
                 sharedPref.getBoolean("should_log_everything", false)
         )
 
-        allItems = intent.getParcelableArrayListExtra<Item>("allItems")
         val currentItem = intent.getIntExtra("currentItem", 0)
 
         var adapter = ScreenSlidePagerAdapter(supportFragmentManager)
@@ -61,7 +70,8 @@ class ReaderActivity : AppCompatActivity() {
         (indicator as CircleIndicator).setViewPager(pager)
 
         if (markOnScroll) {
-            pager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() {
+            pager.addOnPageChangeListener(
+                    object : ViewPager.SimpleOnPageChangeListener() {
                         var isLastItem = false
 
                         override fun onPageSelected(position: Int) {
@@ -86,15 +96,26 @@ class ReaderActivity : AppCompatActivity() {
                                                                     "body success: ${response.body()?.success} " +
                                                                     "body isSuccess: ${response.body()?.isSuccess}"
                                                     Crashlytics.setUserIdentifier(userIdentifier)
-                                            Crashlytics.log(100, "READ_DEBUG_SUCCESS", message)
+                                                    Crashlytics.log(
+                                                            100,
+                                                            "READ_DEBUG_SUCCESS",
+                                                            message
+                                                    )
                                                     Crashlytics.logException(Exception("Was success, but did it work ?"))
                                                 }
                                             }
 
-                                    override fun onFailure(call: Call<SuccessResponse>, t: Throwable) {
+                                            override fun onFailure(
+                                                    call: Call<SuccessResponse>,
+                                                    t: Throwable
+                                            ) {
                                                 if (debugReadingItems) {
                                                     Crashlytics.setUserIdentifier(userIdentifier)
-                                            Crashlytics.log(100, "READ_DEBUG_ERROR", t.message)
+                                                    Crashlytics.log(
+                                                            100,
+                                                            "READ_DEBUG_ERROR",
+                                                            t.message
+                                                    )
                                                     Crashlytics.logException(t)
                                                 }
                                             }
@@ -102,7 +123,8 @@ class ReaderActivity : AppCompatActivity() {
                                 )
                             }
                         }
-            })
+                    }
+            )
         }
     }
 
@@ -111,6 +133,11 @@ class ReaderActivity : AppCompatActivity() {
         pager.clearOnPageChangeListeners()
     }
 
+    override fun onStop() {
+        super.onStop()
+        allItems = ArrayList()
+    }
+
     private inner class ScreenSlidePagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {
         override fun getCount(): Int {
             return allItems.size
@@ -130,4 +157,8 @@ class ReaderActivity : AppCompatActivity() {
         }
         return super.onOptionsItemSelected(item)
     }
+
+    companion object {
+        var allItems: ArrayList<Item> = ArrayList()
+    }
 }

app/src/main/java/apps/amine/bou/readerforselfoss/utils/LinksUtils.kt

@@ -67,8 +67,8 @@ fun Context.openItemUrlInternally(
         app: Activity
 ) {
     if (articleViewer) {
+        ReaderActivity.allItems = allItems
         val intent = Intent(this, ReaderActivity::class.java)
-        intent.putParcelableArrayListExtra("allItems", allItems)
         intent.putExtra("currentItem", currentItem)
         app.startActivity(intent)
     } else {