Null pointer dereference in kh_put_iv

[clayton-shopify]

The following input demonstrates a crash:

class Gryeding
  @@text = nil
  class <<#seSUMER_KEY = 'tesT'
SITE         = 'https://test.jira.cox'

odgf te@@text = nil
  class <<#seSUMER_KEY = 'tesT'
SITE         = 'https://test.jira.cox'

odgf text
!   @@text
  end
endxt
!   @@text
  end
end

Greeding.text= "hello world"
puts Greedmng.new.text

ASAN report:

==62698==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0001046b023d bp 0x7fff5b688130 sp 0x7fff5b687ed0 T0)
==62698==The signal is caused by a READ memory access.
==62698==Hint: address points to the zero page.
    #0 0x1046b023c in kh_put_iv (mruby:x86_64+0x10014223c)
    #1 0x1046b3dae in iv_put (mruby:x86_64+0x100145dae)
    #2 0x1046bc157 in mrb_mod_cv_set (mruby:x86_64+0x10014e157)
    #3 0x1046bd1c3 in mrb_vm_cv_set (mruby:x86_64+0x10014f1c3)
    #4 0x1046d6eb1 in mrb_vm_exec (mruby:x86_64+0x100168eb1)
    #5 0x1046d2f49 in mrb_vm_run (mruby:x86_64+0x100164f49)
    #6 0x104705859 in mrb_top_run (mruby:x86_64+0x100197859)
    #7 0x1047d6845 in mrb_load_exec (mruby:x86_64+0x100268845)
    #8 0x1047d7655 in mrb_load_file_cxt (mruby:x86_64+0x100269655)
    #9 0x10456fe76 in main mruby.c:227
    #10 0x7fffbbbba234 in start (libdyld.dylib:x86_64+0x5234)

==62698==Register values:
rax = 0x0000000000000000  rbx = 0x00007fff5b688180  rcx = 0x2f2f3a7370747470  rdx = 0x00000000000002a2
rdi = 0x0000100000000000  rsi = 0x05e5f74e6e0e8e8e  rbp = 0x00007fff5b688130  rsp = 0x00007fff5b687ed0
 r8 = 0x00000000000002a2   r9 = 0x2f2f3a7370747468  r10 = 0x00000001056f4a48  r11 = 0xa5e89a42d37c00ef
r12 = 0xf2f20000f1f1f1f1  r13 = 0x00001fffeb6d1e88  r14 = 0xf2f20000f2f2f2f2  r15 = 0xf2f2f2f2f2040000
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (mruby:x86_64+0x10014223c) in kh_put_iv
==62698==ABORTING
Abort trap: 6

This issue was reported by https://hackerone.com/ilsani