1 files changed, 2 insertions, 1 deletions

diff --git a/core/apps/calibrate/main.cpp b/core/apps/calibrate/main.cpp
index 1c295eb..ec9b5ec 100644
--- a/core/apps/calibrate/main.cpp
+++ b/core/apps/calibrate/main.cpp
@@ -35,3 +35,4 @@ int main( int argc, char ** argv )
 #ifdef QWS
-    if ( QWSServer::mouseHandler() ->inherits("QCalibratedMouseHandler") ) {
+    if ( QWSServer::mouseHandler() &&
+         QWSServer::mouseHandler() ->inherits("QCalibratedMouseHandler") ) {
 #endif