I've found it!
```
diff --git a/lemon/lemon.c b/lemon/lemon.c
index 75fc7aa..a35ef0a 100644
--- a/lemon/lemon.c
+++ b/lemon/lemon.c
@@ -3571,7 +3571,7 @@ PRIVATE int compute_action(struct lemon *lemp, struct action *ap)
/* Since a SHIFT is inherient after a prior REDUCE, convert any
** SHIFTREDUCE action with a nonterminal on the LHS into a simple
** REDUCE action: */
- if( ap->sp->index>=lemp->nterminal ){
+ if( ap->sp->index>lemp->nterminal){
act = lemp->minReduce + ap->x.rp->iRule;
}else{
act = lemp->minShiftReduce + ap->x.rp->iRule;
```