diff --git a/docs/changelog.rst b/docs/changelog.rst
index 950070aab..b69d1a214 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -78,6 +78,8 @@ Detailed list of changes
 
 - Wayland KDE: Fix selecting in un-focused OS window not working correctly (:iss:`6095`)
 
+- X11: Fix a crash if the X server requests clipboard data after we have relinquished the clipboard (:iss:`5650`)
+
 
 0.27.1 [2023-02-07]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
diff --git a/glfw/x11_window.c b/glfw/x11_window.c
index 5fb567a19..137c69b2b 100644
--- a/glfw/x11_window.c
+++ b/glfw/x11_window.c
@@ -719,6 +719,7 @@ static bool createNativeWindow(_GLFWwindow* window,
 static size_t
 get_clipboard_data(const _GLFWClipboardData *cd, const char *mime, char **data) {
     *data = NULL;
+    if (cd->get_data == NULL) { return 0; }
     GLFWDataChunk chunk = cd->get_data(mime, NULL, cd->ctype);
     char *buf = NULL;
     size_t sz = 0, cap = 0;