gdbmgr option DQ error

Hi, I am new to use gdbmgr. My OS is centos 7. It works well when I input :DI to start gdbmgr in vim. But there are a problem when I quit the gdbmgr.
I input :DQ to quit gdbmgr and get some errors.
Here is the messages:

Error detected while processing function gdbmgr#GdbMgrClose..<SNR>38_GdbMgrBuildBufList:
line 11:
E716: Key not present in Dictionary: 10
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[curbuf].code
line 12:
E121: Undefined variable: firstcode
E15: Invalid expression: firstcode
line 14:
E121: Undefined variable: code
E15: Invalid expression: code != 'S'
line 17:
E121: Undefined variable: code
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[code].nxt
line 19:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode == firstcode
line 22:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode
line 14:
E121: Undefined variable: code
E15: Invalid expression: code != 'S'
line 17:
E121: Undefined variable: code
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[code].nxt
line 19:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode == firstcode
line 22:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode
line 14:
E121: Undefined variable: code
E15: Invalid expression: code != 'S'
line 17:
E121: Undefined variable: code
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[code].nxt
line 19:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode == firstcode
line 22:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode
line 14:
E121: Undefined variable: code
E15: Invalid expression: code != 'S'
line 17:
E121: Undefined variable: code
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[code].nxt
line 19:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode == firstcode
line 22:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode
line 14:
E121: Undefined variable: code
E15: Invalid expression: code != 'S'
line 17:
E121: Undefined variable: code
E15: Invalid expression: s:gdbmgr_registry_{t:gdbmgrtab}[code].nxt
line 19:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode == firstcode
line 22:
E121: Undefined variable: nxtcode
E15: Invalid expression: nxtcode

Does anyone knows how to solve this problem?
much appreciated if you could

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