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-rw-r--r--mrbgems/mruby-os-memsize/src/memsize.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mrbgems/mruby-os-memsize/src/memsize.c b/mrbgems/mruby-os-memsize/src/memsize.c
index 0bdd2c516..abfd94268 100644
--- a/mrbgems/mruby-os-memsize/src/memsize.c
+++ b/mrbgems/mruby-os-memsize/src/memsize.c
@@ -33,6 +33,7 @@ os_memsize_of_method(mrb_state* mrb, mrb_value method_obj)
size_t size;
mrb_value proc_value = mrb_obj_iv_get(mrb, mrb_obj_ptr(method_obj),
mrb_intern_lit(mrb, "_proc"));
+ if (mrb_nil_p(proc_value)) return 0;
struct RProc *proc = mrb_proc_ptr(proc_value);
size = sizeof(struct RProc);