fix

qic.c

@@ -5657,11 +5657,13 @@ void compile_node(buffer_t *gbuf, buffer_t *buf, list_t *ctx, table_t *ltab,
 
       if (n) {
         node_t *r = mexpr_eval(n);
-        if (r->tag == N_EXPRSTMT)
-          r = r->a;
+        if (r != NULL) {
+          if (r->tag == N_EXPRSTMT)
+            r = r->a;
 
-        if (r != NULL && IS_EXPR(r))
-          n = r;
+          if (IS_EXPR(r))
+            n = r;
+        }
 
         compile_node(gbuf, buf, ctx, ltab, lstk, sstk, lbl, n);
       } else