diff --git a/README.md b/README.md
index 4537ddd960..0827778730 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,8 @@ If you want to support Xabber development you can buy [Xabber VIP](https://play.
 
 [![Donate with PayPal](https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=G9AYTUSXCWRVL)
 
+[![Patreon](https://c5.patreon.com/external/logo/become_a_patron_button.png)](https://www.patreon.com/xabber)
+
 ## Feedback
 
 info [at] xabber.com
diff --git a/xabber/build.gradle b/xabber/build.gradle
index 0ada58ffac..42119a1d8d 100644
--- a/xabber/build.gradle
+++ b/xabber/build.gradle
@@ -10,8 +10,8 @@ android {
     defaultConfig {
         minSdkVersion 15
         targetSdkVersion 27
-        versionCode 467
-        versionName '2.2.1(467)'
+        versionCode 468
+        versionName '2.2.1(468)'
     }
 
     lintOptions {
@@ -193,6 +193,15 @@ dependencies {
     }
 
     implementation group: 'org.bouncycastle', name: 'bcpkix-jdk15on', version: '1.58'
+
+    // leak canary
+    debugImplementation 'com.squareup.leakcanary:leakcanary-android:1.5.4'
+    releaseImplementation 'com.squareup.leakcanary:leakcanary-android-no-op:1.5.4'
+
+    // block canary
+    debugImplementation 'com.github.markzhai:blockcanary-android:1.5.0'
+    releaseCompile 'com.github.markzhai:blockcanary-no-op:1.5.0'
+
 }
 apply plugin: 'com.google.gms.google-services'
 
diff --git a/xabber/src/main/java/com/xabber/android/data/Application.java b/xabber/src/main/java/com/xabber/android/data/Application.java
index 67e4a7ccc5..83a9cf37e7 100644
--- a/xabber/src/main/java/com/xabber/android/data/Application.java
+++ b/xabber/src/main/java/com/xabber/android/data/Application.java
@@ -17,12 +17,15 @@
 import android.app.Activity;
 import android.content.Context;
 import android.os.Handler;
+import android.os.StrictMode;
 import android.support.annotation.NonNull;
 import android.support.multidex.MultiDex;
 
 import com.crashlytics.android.Crashlytics;
 import com.crashlytics.android.core.CrashlyticsCore;
 import com.frogermcs.androiddevmetrics.AndroidDevMetrics;
+import com.github.moduth.blockcanary.BlockCanary;
+import com.squareup.leakcanary.LeakCanary;
 import com.xabber.android.BuildConfig;
 import com.xabber.android.R;
 import com.xabber.android.data.account.AccountManager;
@@ -57,8 +60,8 @@
 import com.xabber.android.data.roster.RosterManager;
 import com.xabber.android.data.xaccount.XabberAccountManager;
 import com.xabber.android.service.XabberService;
+import com.xabber.android.utils.AppBlockCanaryContext;
 
-import io.fabric.sdk.android.Fabric;
 import org.jivesoftware.smack.provider.ProviderFileLoader;
 import org.jivesoftware.smack.provider.ProviderManager;
 
@@ -74,6 +77,8 @@
 import java.util.concurrent.Future;
 import java.util.concurrent.ThreadFactory;
 
+import io.fabric.sdk.android.Fabric;
+
 /**
  * Base entry point.
  *
@@ -304,6 +309,30 @@ public boolean isClosing() {
     @Override
     public void onCreate() {
         super.onCreate();
+
+        if (BuildConfig.DEBUG) {
+            /** Leak Canary */
+            if (LeakCanary.isInAnalyzerProcess(this)) {
+                // This process is dedicated to LeakCanary for heap analysis.
+                // You should not init your app in this process.
+                return;
+            }
+            LeakCanary.install(this);
+
+            /** Block Canary */
+            BlockCanary.install(this, new AppBlockCanaryContext()).start();
+
+            /** Android Dev Metrics */
+            AndroidDevMetrics.initWith(this);
+
+            /** Strict Mode */
+            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
+                    .detectAll()
+                    .penaltyLog()
+                    .build());
+        }
+
+        /** Crashlytics */
         // Set up Crashlytics, disabled for debug builds
         Crashlytics crashlyticsKit = new Crashlytics.Builder()
                 .core(new CrashlyticsCore.Builder().disabled(BuildConfig.DEBUG).build())
@@ -314,10 +343,6 @@ public void onCreate() {
             Fabric.with(this, crashlyticsKit);
         }
 
-        if (BuildConfig.DEBUG) {
-            AndroidDevMetrics.initWith(this);
-        }
-
         Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
 
         addManagers();
diff --git a/xabber/src/main/java/com/xabber/android/data/database/sqlite/PhraseTable.java b/xabber/src/main/java/com/xabber/android/data/database/sqlite/PhraseTable.java
index 1506a1115b..ee85616df7 100644
--- a/xabber/src/main/java/com/xabber/android/data/database/sqlite/PhraseTable.java
+++ b/xabber/src/main/java/com/xabber/android/data/database/sqlite/PhraseTable.java
@@ -133,7 +133,7 @@ public long write(Long id, String value, String user, String group,
         return id;
     }
 
-    void remove(long id) {
+    public void remove(long id) {
         SQLiteDatabase db = databaseManager.getWritableDatabase();
         db.delete(NAME, Fields._ID + " = ?",
                 new String[]{String.valueOf(id)});
diff --git a/xabber/src/main/java/com/xabber/android/data/message/phrase/PhraseManager.java b/xabber/src/main/java/com/xabber/android/data/message/phrase/PhraseManager.java
index ebbeb17f78..32b805fc3d 100644
--- a/xabber/src/main/java/com/xabber/android/data/message/phrase/PhraseManager.java
+++ b/xabber/src/main/java/com/xabber/android/data/message/phrase/PhraseManager.java
@@ -129,7 +129,11 @@ public void updateOrCreatePhrase(Phrase phrase, String value, String user,
      * @param index
      */
     public void removePhrase(int index) {
-        phrases.remove(getPhrase(index));
+        Phrase phrase = getPhrase(index);
+        if (phrase != null) {
+            phrases.remove(phrase);  // remove from the local list
+            PhraseTable.getInstance().remove(phrase.getId());  // remove from database
+        }
     }
 
     private void writePhrase(final Phrase phrase, final String value,
diff --git a/xabber/src/main/java/com/xabber/android/utils/AppBlockCanaryContext.java b/xabber/src/main/java/com/xabber/android/utils/AppBlockCanaryContext.java
new file mode 100644
index 0000000000..5c604522c5
--- /dev/null
+++ b/xabber/src/main/java/com/xabber/android/utils/AppBlockCanaryContext.java
@@ -0,0 +1,20 @@
+package com.xabber.android.utils;
+
+import com.github.moduth.blockcanary.BlockCanaryContext;
+import com.xabber.android.BuildConfig;
+
+
+/**
+ * Configuration class. Used in Block Canary - ui-block detection library for Android
+ */
+
+public class AppBlockCanaryContext extends BlockCanaryContext {
+
+    public String provideQualifier() {
+        return BuildConfig.VERSION_NAME;
+    }
+
+    public int provideBlockThreshold() {
+        return 1000;
+    }
+}