diff --git a/code/qcommon/vm.c b/code/qcommon/vm.c
index c500aea6..ba9886cd 100644
--- a/code/qcommon/vm.c
+++ b/code/qcommon/vm.c
@@ -765,14 +765,14 @@ locals from sp
 ==============
 */
 
-intptr_t	QDECL VM_Call( vm_t *vm, int callnum, ... ) {
+intptr_t QDECL VM_Call( vm_t *vm, int callnum, ... )
+{
 	vm_t	*oldVM;
 	intptr_t r;
 	int i;
 
-	if ( !vm ) {
-		Com_Error( ERR_FATAL, "VM_Call with NULL vm" );
-	}
+	if(!vm || !vm->name[0])
+		Com_Error(ERR_FATAL, "VM_Call with NULL vm");
 
 	oldVM = currentVM;
 	currentVM = vm;