diff --git a/autotests/CMakeLists.txt b/autotests/CMakeLists.txt
index f12a8e67d..8efa3d322 100644
--- a/autotests/CMakeLists.txt
+++ b/autotests/CMakeLists.txt
@@ -40,3 +40,9 @@ ecm_add_test(
     LINK_LIBRARIES neochat Qt::Test
     TEST_NAME chatbarcachetest
 )
+
+ecm_add_test(
+    chatdocumenthandlertest.cpp
+    LINK_LIBRARIES neochat Qt::Test
+    TEST_NAME chatdocumenthandlertest
+)
diff --git a/autotests/chatdocumenthandlertest.cpp b/autotests/chatdocumenthandlertest.cpp
new file mode 100644
index 000000000..7194ec92c
--- /dev/null
+++ b/autotests/chatdocumenthandlertest.cpp
@@ -0,0 +1,36 @@
+// SPDX-FileCopyrightText: 2023 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#include <QObject>
+#include <QTest>
+
+#include "chatdocumenthandler.h"
+#include "neochatconfig.h"
+
+class ChatDocumentHandlerTest : public QObject
+{
+    Q_OBJECT
+
+private:
+    ChatDocumentHandler emptyHandler;
+
+private Q_SLOTS:
+    void initTestCase();
+
+    void nullComplete();
+};
+
+void ChatDocumentHandlerTest::initTestCase()
+{
+    // HACK: this is to stop KStatusNotifierItem SEGFAULTING on cleanup.
+    NeoChatConfig::self()->setSystemTray(false);
+}
+
+void ChatDocumentHandlerTest::nullComplete()
+{
+    QTest::ignoreMessage(QtWarningMsg, "complete called with m_document set to nullptr.");
+    emptyHandler.complete(0);
+}
+
+QTEST_MAIN(ChatDocumentHandlerTest)
+#include "chatdocumenthandlertest.moc"
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index dc9d7fe1c..ee7b67822 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -311,6 +311,13 @@ ecm_qt_declare_logging_category(neochat
     DEFAULT_SEVERITY Info
 )
 
+ecm_qt_declare_logging_category(neochat
+    HEADER "chatdocumenthandler_logging.h"
+    IDENTIFIER "ChatDocumentHandling"
+    CATEGORY_NAME "org.kde.neochat.chatdocumenthandler"
+    DEFAULT_SEVERITY Info
+)
+
 add_executable(neochat-app
     main.cpp
 )
diff --git a/src/chatdocumenthandler.cpp b/src/chatdocumenthandler.cpp
index 303e42b6f..a980010f0 100644
--- a/src/chatdocumenthandler.cpp
+++ b/src/chatdocumenthandler.cpp
@@ -14,6 +14,8 @@
 #include <Sonnet/BackgroundChecker>
 #include <Sonnet/Settings>
 
+#include "chatdocumenthandler_logging.h"
+
 class SyntaxHighlighter : public QSyntaxHighlighter
 {
 public:
@@ -98,7 +100,7 @@ ChatDocumentHandler::ChatDocumentHandler(QObject *parent)
     , m_document(nullptr)
     , m_cursorPosition(-1)
     , m_highlighter(new SyntaxHighlighter(this))
-    , m_completionModel(new CompletionModel())
+    , m_completionModel(new CompletionModel(this))
 {
     connect(this, &ChatDocumentHandler::roomChanged, this, [this]() {
         m_completionModel->setRoom(m_room);
@@ -213,6 +215,15 @@ void ChatDocumentHandler::setChatBarCache(ChatBarCache *chatBarCache)
 
 void ChatDocumentHandler::complete(int index)
 {
+    if (m_document == nullptr) {
+        qCWarning(ChatDocumentHandling) << "complete called with m_document set to nullptr.";
+        return;
+    }
+    if (m_completionModel->autoCompletionType() == CompletionModel::None) {
+        qCWarning(ChatDocumentHandling) << "complete called with m_completionModel->autoCompletionType() == CompletionModel::None.";
+        return;
+    }
+
     if (m_completionModel->autoCompletionType() == CompletionModel::User) {
         auto name = m_completionModel->data(m_completionModel->index(index, 0), CompletionModel::DisplayNameRole).toString();
         auto id = m_completionModel->data(m_completionModel->index(index, 0), CompletionModel::SubtitleRole).toString();
@@ -296,15 +307,17 @@ void ChatDocumentHandler::setSelectionEnd(int position)
 
 QString ChatDocumentHandler::getText() const
 {
-    if (!m_room) {
-        return QString();
+    if (!m_chatBarCache) {
+        qCWarning(ChatDocumentHandling) << "getText called with m_chatBarCache set to nullptr.";
+        return {};
     }
     return m_chatBarCache->text();
 }
 
 void ChatDocumentHandler::pushMention(const Mention mention) const
 {
-    if (!m_room) {
+    if (!m_chatBarCache) {
+        qCWarning(ChatDocumentHandling) << "pushMention called with m_chatBarCache set to nullptr.";
         return;
     }
     m_chatBarCache->mentions()->push_back(mention);
diff --git a/src/chatdocumenthandler.h b/src/chatdocumenthandler.h
index 617b9ce16..2e22e30c4 100644
--- a/src/chatdocumenthandler.h
+++ b/src/chatdocumenthandler.h
@@ -88,7 +88,7 @@ class ChatDocumentHandler : public QObject
      * This is typically provided to a qml component to visualise the current
      * completion results.
      */
-    Q_PROPERTY(CompletionModel *completionModel READ completionModel NOTIFY completionModelChanged)
+    Q_PROPERTY(CompletionModel *completionModel READ completionModel CONSTANT)
 
     /**
      * @brief The current room that the the text document is being handled for.
@@ -133,7 +133,6 @@ public:
 
     Q_INVOKABLE void complete(int index);
 
-    void updateCompletions();
     CompletionModel *completionModel() const;
 
     [[nodiscard]] QColor mentionColor() const;
@@ -147,7 +146,6 @@ Q_SIGNALS:
     void cursorPositionChanged();
     void roomChanged();
     void chatBarCacheChanged();
-    void completionModelChanged();
     void selectionStartChanged();
     void selectionEndChanged();
     void errorColorChanged();