1 files changed, 1 insertions, 0 deletions
diff --git a/src/types/str.c b/src/types/str.c
index 4b257cb..0c8d63a 100644
--- a/src/types/str.c
+++ b/src/types/str.c
@@ -56,6 +56,7 @@ void str_popf(str* s, int len){
 
 void str_popb(str* s, int len){
   s->len -= len;
+  s->len = s->len > 0 ? s->len : 0;
   s->c[s->len] = 0;
 }