diff --git a/tests/events.c b/tests/events.c
index f82b8fc9..809da473 100644
--- a/tests/events.c
+++ b/tests/events.c
@@ -242,8 +242,11 @@ static void window_refresh_callback(GLFWwindow window)
 {
     printf("%08x at %0.3f: Window refresh\n", counter++, glfwGetTime());
 
-    glClear(GL_COLOR_BUFFER_BIT);
-    glfwSwapBuffers(window);
+    if (glfwGetCurrentContext())
+    {
+        glClear(GL_COLOR_BUFFER_BIT);
+        glfwSwapBuffers(window);
+    }
 }
 
 static void window_focus_callback(GLFWwindow window, int activated)