diff --git a/plugins/sms/conversationsdbusinterface.cpp b/plugins/sms/conversationsdbusinterface.cpp
index b2b95674b..ff68e6f75 100644
--- a/plugins/sms/conversationsdbusinterface.cpp
+++ b/plugins/sms/conversationsdbusinterface.cpp
@@ -91,6 +91,16 @@ QVariantList ConversationsDbusInterface::activeConversations()
 
 void ConversationsDbusInterface::requestConversation(const qint64& conversationID, int start, int end)
 {
+    if (start < 0 || end < 0) {
+        qCWarning(KDECONNECT_CONVERSATIONS) << "requestConversation" << "Start and end must be >= 0";
+        return;
+    }
+
+    if (end - start < 0) {
+        qCWarning(KDECONNECT_CONVERSATIONS) << "requestConversation" <<"Start must be before end";
+        return;
+    }
+
     RequestConversationWorker* worker = new RequestConversationWorker(conversationID, start, end, this);
     connect(worker, &RequestConversationWorker::conversationMessageRead,
             this, &ConversationsDbusInterface::conversationUpdated,