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-rw-r--r--src/string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/string.c b/src/string.c
index 458c511dc..44e3c9069 100644
--- a/src/string.c
+++ b/src/string.c
@@ -2759,7 +2759,7 @@ mrb_str_cat(mrb_state *mrb, mrb_value str, const char *ptr, size_t len)
MRB_API mrb_value
mrb_str_cat_cstr(mrb_state *mrb, mrb_value str, const char *ptr)
{
- return mrb_str_cat(mrb, str, ptr, strlen(ptr));
+ return mrb_str_cat(mrb, str, ptr, ptr ? strlen(ptr) : 0);
}
MRB_API mrb_value