Workbook#get_worksheet_by_name crashes

[rellampec]

The code below without calling #get_worksheet_by_name works perfectly well (so commenting lines #1 and #3)

    unless sheet = workbook.get_worksheet_by_name(name)
      sheet = workbook.add_worksheet(name)
    end

   sheet.append_row(["TEST", nil, nil])

Running the code crashes with the info below (omitted client code):

-- Control frame information -----------------------------------------------
c:0034 p:---- s:0189 e:000188 CFUNC  :worksheet_write_string
c:0033 p:0020 s:0180 e:000179 METHOD C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel/binding/worksheet.rb:210
c:0032 p:0378 s:0172 e:000171 METHOD C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:479
c:0031 p:0046 s:0164 e:000163 BLOCK  C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:440 [FINISH]
c:0030 p:---- s:0158 e:000157 IFUNC
c:0029 p:---- s:0155 e:000154 CFUNC  :each
c:0028 p:---- s:0152 e:000151 CFUNC  :each_with_index
c:0027 p:0008 s:0148 e:000147 METHOD C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:435
c:0026 p:0022 s:0141 e:000140 METHOD C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:515

-- Ruby level backtrace information ----------------------------------------
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:515:in `append_row'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:435:in `write_row'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:435:in `each_with_index'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:435:in `each'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:440:in `block in write_row'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel.rb:479:in `write_value'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel/binding/worksheet.rb:210:in `write_string'
C:/ruby/Ruby27-x64/lib/ruby/gems/2.7.0/gems/fast_excel-0.5.0/lib/fast_excel/binding/worksheet.rb:210:in `worksheet_write_string'

-- C level backtrace information -------------------------------------------
C:\Windows\SYSTEM32\ntdll.dll(ZwWaitForSingleObject+0x14) [0x00007ffba4b2f3f4]
C:\Windows\System32\KERNELBASE.dll(WaitForSingleObjectEx+0x8e) [0x00007ffba22044ee]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_bugreport+0x34b) [0x00000000653c657b]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_bug_for_fatal_signal+0x7f) [0x00000000651df83f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(ruby_sysinit+0x1040) [0x00000000653207a0]
 [0x0000000000401ea2]
C:\Windows\System32\msvcrt.dll(_C_specific_handler+0x98) [0x00007ffba3b2b248]
C:\Windows\SYSTEM32\ntdll.dll(_chkstk+0x12f) [0x00007ffba4b3441f]
C:\Windows\SYSTEM32\ntdll.dll(RtlFindCharInUnicodeString+0xa96) [0x00007ffba4aae466]
C:\Windows\SYSTEM32\ntdll.dll(KiUserExceptionDispatcher+0x2e) [0x00007ffba4b3340e]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\extensions\x64-mingw32\2.7.0\fast_excel-0.5.0\libxlsxwriter.dll(lxw_worksheet_write_single_row+0x251) [0x00000000615bcd81]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\gems\ffi-1.12.2-x64-mingw32\lib\2.7\ffi_c.so(Init_ffi_c+0xc41) [0x0000000007ed3fd1]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\gems\ffi-1.12.2-x64-mingw32\lib\2.7\ffi_c.so(Init_ffi_c+0x8a4) [0x0000000007ed3c34]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\gems\ffi-1.12.2-x64-mingw32\lib\2.7\ffi_c.so(Init_ffi_c+0x8e9) [0x0000000007ed3c79]
 [0x0000000007ec9470]
 [0x0000000007ecccdd]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\gems\ffi-1.12.2-x64-mingw32\lib\2.7\ffi_c.so(Init_ffi_c+0xbf8) [0x0000000007ed3f88]
C:\ruby\Ruby27-x64\lib\ruby\gems\2.7.0\gems\ffi-1.12.2-x64-mingw32\lib\2.7\ffi_c.so(Init_ffi_c+0xd6e) [0x0000000007ed40fe]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x228) [0x00000000653b4ce8]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_enc_foreach_name+0x66df) [0x00000000651ced7f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_bh_to_procval+0x2326) [0x00000000653a6b26]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x13c) [0x00000000653af35c]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_ary_each+0x3d) [0x000000006514586d]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_invoke_proc+0x70a) [0x00000000653b003a]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_call_kw+0x178) [0x00000000653b0f28]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_funcall_with_block_kw+0x214) [0x00000000653b3d14]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_rewind_cfp+0x19e) [0x00000000653a370e]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_block_call+0x85) [0x00000000653a3aa5]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_enc_foreach_name+0x1f68) [0x00000000651ca608]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x2f2) [0x00000000653af512]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_ary_each+0x3d) [0x000000006514586d]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x9bf) [0x00000000653a9b5f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x2f2) [0x00000000653af512]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_ary_each+0x3d) [0x000000006514586d]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x2f2) [0x00000000653af512]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_obj_tap+0xe) [0x000000006528cffe]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_call_kw+0x178) [0x00000000653b0f28]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_proc_lambda_p+0x13ae) [0x00000000652c6d1e]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_bh_to_procval+0x2326) [0x00000000653a6b26]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_bh_to_procval+0x24e4) [0x00000000653a6ce4]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_invoke_bmethod+0x1105) [0x00000000653ab415]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x228) [0x00000000653b4ce8]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x2f2) [0x00000000653af512]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_obj_tap+0xe) [0x000000006528cffe]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_hash_compare_by_id_p+0x488) [0x000000006520e988]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_hash_rassoc+0x51f) [0x000000006521193f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_ensure+0x13a) [0x00000000651e9cca]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_hash_foreach+0xb2) [0x0000000065219062]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_hash_assoc+0x31e) [0x0000000065219a6e]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_yield+0x2f2) [0x00000000653af512]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_ary_each+0x3d) [0x000000006514586d]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x34f) [0x00000000653b4e0f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x231) [0x00000000653a93d1]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_get_expanded_load_path+0x13db) [0x000000006524b4fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_f_require_relative+0x47) [0x000000006524b727]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_error_arity+0x34b) [0x000000006539e8fb]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_add_method+0x228) [0x00000000653b4ce8]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_vm_exec+0x9bf) [0x00000000653a9b5f]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(rb_call_end_proc+0x142) [0x00000000651e3e92]
C:\ruby\Ruby27-x64\bin\x64-msvcrt-ruby270.dll(ruby_run_node+0x95) [0x00000000651e8b45]
 [0x0000000000402759]
 [0x00000000004013c1]
 [0x00000000004014f6]
C:\Windows\System32\KERNEL32.DLL(BaseThreadInitThunk+0x1d) [0x00007ffba2ee257d]