diff --git a/CHANGELOG.md b/CHANGELOG.md
index 168eed5..9033889 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,10 @@
 # Change Log
+
+## [4.13.1](https://github.com/deltaDNA/android-sdk/releases/tag/4.13.1)
+
+### Fixed
+- Time consuming calls on engage response errors no longer block the UI thread
+
 ## [4.13.0](https://github.com/deltaDNA/android-sdk/releases/tag/4.13.0)
 
 ### Added
diff --git a/README-CN.md b/README-CN.md
index 455c14f..ddd2e53 100755
--- a/README-CN.md
+++ b/README-CN.md
@@ -43,7 +43,7 @@ allprojects {
 ```
 在你APP的构建脚本
 ```groovy
-compile 'com.deltadna.android:deltadna-sdk:4.13.0'
+compile 'com.deltadna.android:deltadna-sdk:4.13.1'
 ```
 
 ## 初始化
diff --git a/README.md b/README.md
index 44fda11..ebfe2fa 100644
--- a/README.md
+++ b/README.md
@@ -47,7 +47,7 @@ allprojects {
 In your app's build script:
 ```groovy
 dependencies {
-    implementation 'com.deltadna.android:deltadna-sdk:4.13.0'
+    implementation 'com.deltadna.android:deltadna-sdk:4.13.1'
 }
 ```
 The Java source and target compatibility needs to be set to 1.8 in you app's build script:
diff --git a/gradle.properties b/gradle.properties
index 7aef2c3..e07e712 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,5 @@
 GROUP=com.deltadna.android
-VERSION_NAME=4.13.0
+VERSION_NAME=4.13.1
 
 POM_DESCRIPTION=deltaDNA SDK for Android
 POM_URL=https://github.com/deltaDNA/android-sdk
diff --git a/library-notifications/README-CN.md b/library-notifications/README-CN.md
index 0e62c76..37d0374 100755
--- a/library-notifications/README-CN.md
+++ b/library-notifications/README-CN.md
@@ -41,8 +41,8 @@ allprojects {
 ```
 在你APP的构建脚本
 ```groovy
-compile 'com.deltadna.android:deltadna-sdk:4.13.0'
-compile 'com.deltadna.android:deltadna-sdk-notifications:4.13.0'
+compile 'com.deltadna.android:deltadna-sdk:4.13.1'
+compile 'com.deltadna.android:deltadna-sdk-notifications:4.13.1'
 ```
 
 ## 整合
diff --git a/library-notifications/README.md b/library-notifications/README.md
index f53beb5..d992639 100644
--- a/library-notifications/README.md
+++ b/library-notifications/README.md
@@ -41,8 +41,8 @@ allprojects {
 In your app's build script:
 ```groovy
 dependencies {
-    implementation 'com.deltadna.android:deltadna-sdk:4.13.0'
-    implementation 'com.deltadna.android:deltadna-sdk-notifications:4.13.0'
+    implementation 'com.deltadna.android:deltadna-sdk:4.13.1'
+    implementation 'com.deltadna.android:deltadna-sdk-notifications:4.13.1'
 }
 ```
 
diff --git a/library/src/main/java/com/deltadna/android/sdk/EventHandler.java b/library/src/main/java/com/deltadna/android/sdk/EventHandler.java
index f9d6b13..be37e51 100644
--- a/library/src/main/java/com/deltadna/android/sdk/EventHandler.java
+++ b/library/src/main/java/com/deltadna/android/sdk/EventHandler.java
@@ -18,6 +18,9 @@
 
 import android.os.AsyncTask;
 import androidx.annotation.Nullable;
+
+import android.os.Handler;
+import android.os.Looper;
 import android.util.Log;
 import com.deltadna.android.sdk.helpers.ClientInfo;
 import com.deltadna.android.sdk.listeners.EngageListener;
@@ -48,6 +51,8 @@ final class EventHandler {
             new ScheduledThreadPoolExecutor(1, r -> new Thread(
                     r,
                     EventHandler.class.getSimpleName()));
+
+    private final Handler mainThreadTaskHandler = new Handler(Looper.getMainLooper());
     
     private final EventStore events;
     private final EngageStore engagements;
@@ -218,25 +223,29 @@ public void onCompleted(Response<JSONObject> result) {
 
                 @Override
                 public void onError(Throwable t) {
-                    final JSONObject cached = engagements.get(engagement);
-                    if (cached != null) {
-                        try {
-                            engagement.setResponse(new Response<>(
-                                    200,
-                                    true,
-                                    null,
-                                    cached.put("isCachedResponse", true),
-                                    null));
-
-                            Log.d(TAG, "Using cached response " + engagement.getJson());
-
-                            listener.onCompleted(engagement);
-                        } catch (JSONException e) {
-                            listener.onError(e);
+                    // This needs to be run off the main thread, as it involves blocking database
+                    // operations that can cause ANRs.
+                    executor.execute(() -> {
+                        final JSONObject cached = engagements.get(engagement);
+                        if (cached != null) {
+                            try {
+                                engagement.setResponse(new Response<>(
+                                        200,
+                                        true,
+                                        null,
+                                        cached.put("isCachedResponse", true),
+                                        null));
+
+                                Log.d(TAG, "Using cached response " + engagement.getJson());
+
+                                mainThreadTaskHandler.post(() -> listener.onCompleted(engagement));
+                            } catch (JSONException e) {
+                                mainThreadTaskHandler.post(() -> listener.onError(e));
+                            }
+                        } else {
+                            mainThreadTaskHandler.post(() -> listener.onError(t));
                         }
-                    } else {
-                        listener.onError(t);
-                    }
+                    });
                 }
             }, "config".equalsIgnoreCase(engagement.name) && "internal".equalsIgnoreCase(engagement.flavour));
             return null;