1 files changed, 2 insertions, 0 deletions
diff --git a/src/ssa.c b/src/ssa.c
index 87bf453..7af342b 100644
--- a/src/ssa.c
+++ b/src/ssa.c
@@ -198,11 +198,13 @@ top:
 		goto top;
 	}
 
+	if (b->s1)
 	foreach_blk_param(pi, b->s1->params) {
 		struct val p = blk_param_at(b->s1->params, pi);
 		vec_append(&b->args1, &p);
 	}
 
+	if (b->s2)
 	foreach_blk_param(pi, b->s2->params) {
 		struct val p = blk_param_at(b->s2->params, pi);
 		vec_append(&b->args2, &p);