diff --git a/src/debug/AssertInGuiThread.hpp b/src/debug/AssertInGuiThread.hpp
index 6dc144963b3..8c71d5e2402 100644
--- a/src/debug/AssertInGuiThread.hpp
+++ b/src/debug/AssertInGuiThread.hpp
@@ -8,7 +8,14 @@ namespace chatterino {
 
 static bool isGuiThread()
 {
-    return QCoreApplication::instance()->thread() == QThread::currentThread();
+    auto instance = QCoreApplication::instance();
+
+    if (instance != nullptr)
+    {
+        return instance->thread() == QThread::currentThread();
+    }
+
+    return false;
 }
 
 static void assertInGuiThread()