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-rw-r--r--src/error.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/src/error.c b/src/error.c
index feec9dbc5..87e4d6412 100644
--- a/src/error.c
+++ b/src/error.c
@@ -127,7 +127,12 @@ exc_inspect(mrb_state *mrb, mrb_value exc)
mesg = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "mesg"));
file = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "file"));
line = mrb_attr_get(mrb, exc, mrb_intern_lit(mrb, "line"));
- append_mesg = !mrb_nil_p(mesg) && RSTRING_LEN(mesg) > 0;
+
+ append_mesg = !mrb_nil_p(mesg);
+ if (append_mesg) {
+ mesg = mrb_obj_as_string(mrb, mesg);
+ append_mesg = RSTRING_LEN(mesg) > 0;
+ }
if (!mrb_nil_p(file) && !mrb_nil_p(line)) {
str = mrb_str_dup(mrb, file);