diff --git a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
index c48c83296..1259707d5 100644
--- a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
@@ -644,7 +644,8 @@ public class XmppConnectionService extends Service {
 		String pushedAccountHash = null;
 		boolean interactive = false;
 		if (action != null) {
-			final Conversation c = findConversationByUuid(intent.getStringExtra("uuid"));
+			final String uuid = intent.getStringExtra("uuid");
+			final Conversation c = findConversationByUuid(uuid);
 			switch (action) {
 				case ConnectivityManager.CONNECTIVITY_ACTION:
 					if (hasInternetConnection() && Config.RESET_ATTEMPT_COUNT_ON_NETWORK_CHANGE) {
@@ -687,7 +688,11 @@ public class XmppConnectionService extends Service {
 					}
 					break;
 				case ACTION_MARK_AS_READ:
-					sendReadMarker(c);
+					if (c != null) {
+						sendReadMarker(c);
+					} else {
+						Log.d(Config.LOGTAG,"received mark read intent for unknown conversation ("+uuid+")");
+					}
 					break;
 				case AudioManager.RINGER_MODE_CHANGED_ACTION:
 					if (dndOnSilentMode()) {