1 files changed, 6 insertions, 0 deletions
diff --git a/nx-X11/programs/Xserver/xkb/xkbUtils.c b/nx-X11/programs/Xserver/xkb/xkbUtils.c
index f4b7db3c6..4adcc878d 100644
--- a/nx-X11/programs/Xserver/xkb/xkbUtils.c
+++ b/nx-X11/programs/Xserver/xkb/xkbUtils.c
@@ -674,6 +674,9 @@ CARD16 		grp_mask;
 XkbStatePtr	state= &xkbi->state;
 XkbCompatMapPtr	map;
 
+    if (!state || !xkbi->desc || !xkbi->desc->ctrls || !xkbi->desc->compat)
+        return;
+
     map= xkbi->desc->compat;
     grp_mask= map->groups[state->group].mask;
     state->compat_state = state->mods|grp_mask;
@@ -733,6 +736,9 @@ XkbStatePtr	state= &xkbi->state;
 XkbControlsPtr	ctrls= xkbi->desc->ctrls;
 unsigned char	grp;
 
+    if (!state || !ctrls)
+        return;
+
     state->mods= (state->base_mods|state->latched_mods);
     state->mods|= state->locked_mods;
     state->lookup_mods= state->mods&(~ctrls->internal.mask);