1 files changed, 2 insertions, 1 deletions
diff --git a/spnav.py b/spnav.py
index 05ffe6d..4f1ff6b 100644
--- a/spnav.py
+++ b/spnav.py
@@ -50,7 +50,8 @@ def spnav_open():
 
 def spnav_x11_open(display, window):
     display_ptr = pythonapi.PyCObject_AsVoidPtr(display)
-    libspnav.spnav_x11_open(display_ptr, window)
+    if libspnav.spnav_x11_open(display_ptr, window) == -1:
+        raise Exception('failed to connect to the space navigator daemon')
 
 def spnav_x11_window(window):
     libspnav.spnav_x11_window(window)