Unsupported masking on instruction - Attempting to mask EBP in 'mov' instruction

[recvfrom]

From the latest code in the 'dev' branch:

[CASC] Unsupported masking on instruction. Please open an issue in the git repo with the below information:
  disassembly: mov     dword ptr [ebp-88h], 6E72656Bh
  opcodes: c7 85 78ffffff 6b65726e
{'address': 106L,
 'bytes': ['c7', '85', '78', 'ff', 'ff', 'ff', '6b', '65', '72', '6e'],
 'disassembly': 'mov     dword ptr [ebp-88h], 6E72656Bh',
 'disp': ['x\xff\xff\xff', '0xffffff78L'],
 'imm': ['kern', '0x6e72656b'],
 'modr/m': ['\x85', {'mod': 2, 'reg': 0, 'rm': 5}],
 'opcode': ['\xc7', 'mov'],
 'prefix': [''],
 'sib': ['']}
========================================
Traceback (most recent call last):
  File "C:/Program Files/IDA 7.0/plugins/casc_plugin.py", line 1818, in apply_mask
    self.data.mask_opcodes(self.ui.mask.get_masking())
  File "C:/Program Files/IDA 7.0/plugins/casc_plugin.py", line 1278, in mask_opcodes
    data = self.parser.mask_instruction(instr.ea, mask_options)
  File "C:/Program Files/IDA 7.0/plugins/casc_plugin.py", line 923, in mask_instruction
    current_disassembly[i] = self.mask_operand(x, mask_re, value)
  File "C:/Program Files/IDA 7.0/plugins/casc_plugin.py", line 1190, in mask_operand
    if re.search(operand, to_mask):
  File "C:\Program Files\Python27\Lib\re.py", line 146, in search
    return _compile(pattern, flags).search(string)
  File "C:\Program Files\Python27\Lib\re.py", line 251, in _compile
    raise error, v # invalid expression
sre_constants.error: bad character range

NOTE, I was running with the following change to allow me to use CASC with an x86 shellcode file:

        #   Currently only supports intel_x86
        #if get_file_type() not in [1, 6, 9]:
        #    msg_str = '{0} does not support this file type.\n'
        #    IDAW.msg(msg_str.format(self.wanted_name))
        #    return IDAW.PLUGIN_SKIP