diff --git a/plugin/gui/gui.v b/plugin/gui/gui.v
index 1529307..4ae49a3 100644
--- a/plugin/gui/gui.v
+++ b/plugin/gui/gui.v
@@ -92,6 +92,11 @@ pub fn (g &GUI) on_posix_fd() {
 		}
 		t := event.response_type & ~0x80
 		match t {
+			// Error
+			0 {
+				error_ev := &C.xcb_request_error_t(event)
+				eprintln('Received X11 error: ${error_ev.error_code}')
+			}
 			u8(C.XCB_EXPOSE) {
 				expose_ev := &C.xcb_expose_event_t(event)
 				if expose_ev.window == g.window {
diff --git a/plugin/gui/xcb.v b/plugin/gui/xcb.v
index 24b3e5e..fece731 100644
--- a/plugin/gui/xcb.v
+++ b/plugin/gui/xcb.v
@@ -50,6 +50,15 @@ struct C.xcb_expose_event_t {
 	window C.xcb_window_t
 }
 
+@[typedef]
+struct C.xcb_request_error_t {
+	error_code u8
+	sequence u16
+	bad_value u32
+	minor_opcode u16
+	major_opcode u16
+}
+
 fn C.xcb_connect(&char, &int) &C.xcb_connection_t
 fn C.xcb_disconnect(&C.xcb_connection_t)
 fn C.xcb_flush(&C.xcb_connection_t)