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-rw-r--r--src/error.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/error.c b/src/error.c
index 92f4911f6..062282719 100644
--- a/src/error.c
+++ b/src/error.c
@@ -47,7 +47,7 @@ exc_initialize(mrb_state *mrb, mrb_value exc)
mrb_int argc;
mrb_value *argv;
- if (mrb_get_args(mrb, "|o*", &mesg, &argv, &argc) >= 1) {
+ if (mrb_get_args(mrb, "|o*!", &mesg, &argv, &argc) >= 1) {
mrb_iv_set(mrb, exc, mrb_intern_lit(mrb, "mesg"), mesg);
}
return exc;