diff --git a/CHANGELOG.md b/CHANGELOG.md
index b506c283..56cf777c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,7 +23,12 @@ Changelog of Pull Request Notifier for Bitbucket.
  * PULL_REQUEST_REVIEWERS_NEEDS_WORK_EMAIL
  * PULL_REQUEST_REVIEWERS_NEEDS_WORK_NAME
   
-  [72607d4617b0e7d](https://github.com/tomasbjerre/pull-request-notifier-for-bitbucket/commit/72607d4617b0e7d) Tomas Bjerre *2017-02-01 19:16:26*
+  [6b8832e587d55b0](https://github.com/tomasbjerre/pull-request-notifier-for-bitbucket/commit/6b8832e587d55b0) Tomas Bjerre *2017-02-01 19:23:38*
+
+### GitHub [#194](https://github.com/tomasbjerre/pull-request-notifier-for-bitbucket/issues/194) Pull Request activity throws IllegalArgumentException
+  Avoiding trying to read empty responses from notifications
+  
+  [6723e59c0b892d0](https://github.com/tomasbjerre/pull-request-notifier-for-bitbucket/commit/6723e59c0b892d0) Tomas Bjerre *2017-02-01 19:29:09*
 
 ### No issue
   doc
diff --git a/src/main/java/se/bjurr/prnfb/http/UrlInvoker.java b/src/main/java/se/bjurr/prnfb/http/UrlInvoker.java
index 90b715f4..19e1621d 100644
--- a/src/main/java/se/bjurr/prnfb/http/UrlInvoker.java
+++ b/src/main/java/se/bjurr/prnfb/http/UrlInvoker.java
@@ -46,12 +46,12 @@
 import org.apache.http.util.EntityUtils;
 import org.slf4j.Logger;
 
-import se.bjurr.prnfb.settings.PrnfbHeader;
-import se.bjurr.prnfb.settings.PrnfbNotification;
-
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Optional;
 
+import se.bjurr.prnfb.settings.PrnfbHeader;
+import se.bjurr.prnfb.settings.PrnfbNotification;
+
 /**
  * If told to accept all certificates, an unsafe X509 trust manager is used.<br>
  * <br>
@@ -352,10 +352,13 @@ HttpResponse doInvoke(HttpRequestBase httpRequestBase, HttpClientBuilder builder
               .execute(httpRequestBase);
 
       HttpEntity entity = httpResponse.getEntity();
-      return new HttpResponse(
-          httpRequestBase.getURI(),
-          httpResponse.getStatusLine().getStatusCode(),
-          EntityUtils.toString(entity, UTF_8));
+      String entityString = "";
+      if (entity != null) {
+        entityString = EntityUtils.toString(entity, UTF_8);
+      }
+      URI uri = httpRequestBase.getURI();
+      int statusCode = httpResponse.getStatusLine().getStatusCode();
+      return new HttpResponse(uri, statusCode, entityString);
     } catch (final Exception e) {
       LOG.error("", e);
     } finally {