diff --git a/src/backends/x11/standalone/x11_standalone_glx_backend.cpp b/src/backends/x11/standalone/x11_standalone_glx_backend.cpp
index f8c209d47d..6f4f6b185d 100644
--- a/src/backends/x11/standalone/x11_standalone_glx_backend.cpp
+++ b/src/backends/x11/standalone/x11_standalone_glx_backend.cpp
@@ -714,8 +714,10 @@ void GlxBackend::present(Output *output, const std::shared_ptr<OutputFrame> &fra
 
 void GlxBackend::vblank(std::chrono::nanoseconds timestamp)
 {
-    m_frame->presented(timestamp, PresentationMode::VSync);
-    m_frame.reset();
+    if (m_frame) {
+        m_frame->presented(timestamp, PresentationMode::VSync);
+        m_frame.reset();
+    }
 }
 
 bool GlxBackend::makeCurrent()