Do not assume there is a mouse mode with index 3.

diff --git a/src/Input/FGMouseInput.cxx b/src/Input/FGMouseInput.cxx
index 6d052c8817f544e76db793991f40e92ef09e2e71..90a5efde93bebafc0baa9a398798a05ccfc5b038 100644 (file)
--- a/src/Input/FGMouseInput.cxx
+++ b/src/Input/FGMouseInput.cxx
@@ -641,7 +641,7 @@ void FGMouseInput::processMotion(int x, int y, const osgGA::GUIEventAdapter* ea)
   mouse &m = d->mice[0];
   int modeIndex = m.current_mode;
   // are we in spring-loaded look mode?
-  if (!d->rightClickModeCycle) {
+  if (!d->rightClickModeCycle && m.nModes > 3) {
     if (m.mouse_button_nodes[2]->getBoolValue()) {
       // right mouse is down, force look mode
       modeIndex = 3;