2593650 - SUM stuck in phase PREP_EXTENSION/UPLOAD_FIRST with 'SPDA_PREPARE_PATCH'

The customer using SUM to do the upgrade and stuck in phase PREP_EXTENSION/UPLOAD_FIRST with below error message:

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Severe error(s) occurred in phase PREP_EXTENSION/UPLOAD_FIRST!
Last error code set:
RFC system 'XXX' nr '0X' function 'SPDA_PREPARE_PATCH'
RFC failed with code X key CONVT_NO_NUMBER:
H
INFOV cannot be interpreted as a number
====================

In phase UPLOADFIRST.LOG can find below information:
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1EETQ235 Call of function module "SPDA_PREPARE_PATCH" by RFC failed (error-status "3")
2EETQ360 RFC of "SPDA_PREPARE_PATCH" failed:
2EETQ361 code/exception : 3
2EETQ362 key : CONVT_NO_NUMBER
2EETQ399 H
2EETQ399 INFOV cannot be interpreted as a number
4 ETQ010 Date & Time: 
1EETQ399 Last error code set is: RFC system 'XXX' nr '0X' function 'SPDA_PREPARE_PATCH'
1EETQ399 RFC failed with code 3
1EETQ399Xkey CONVT_NO_NUMBER:
1EETQ399XH
1EETQ399XINFOV cannot be interpreted as a number
1EETQ204 Upgrade phase "UPLOAD_FIRST" aborted with severe errors ("")
==============================

Also it can find below dump file: 
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Category ABAP programming error
Runtime Errors CONVT_NO_NUMBER
Except. CX_SY_CONVERSION_NO_NUMBER
ABAP Program CL_SPDA_EPS_FILE_READER=======CP
Application Component BC-UPG-OCS
==============================

SUM 1.0

 UPLOAD_FIRST, CL_SPDA_EPS_FILE_READER=======CP, SPDA_PREPARE_PATCH , KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , Problem