assembly - Dividing a negative number MASM -

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i've written program that's sums bunch of numbers user , returns average, program gets stuck when try divide negative numbers. under impression dividing negative number allowed, i'm not sure problem here.

include irvine32.inc  ; constants min             =       -100 max             =       -1 1             =       1  .data num             dword   ? nums            dword   ? nums_message    byte    "total numbers: ",0 sum             dword   ? sum_message     byte    "sum: ",0 average         dword   ? average_message byte    "average: ",0 current_loop    dword   ? spaces          byte    "     ",0 invalid_msg     byte    "out of range, number must between [-100...-1]",0 temp            dword   ?  .code main proc      ; enter numbers displayed     mov     ecx, 0     enter_num:     mov     edx, offset prompt_2     call    writestring     call    readint     mov     num, eax      ; check if non-negative     mov     eax, num     mov     ebx, 0     cmp     eax, ebx     jge     average_nums     inc     ecx      ; validate user input     validation_1:         mov     eax, num         mov     ebx, min         cmp     eax, ebx         jge     validation_2      ; if validation fails     invalid:         mov     edx, offset invalid_msg         call    writestring         call    crlf         jmp     enter_num      validation_2:         mov     eax, num         mov     ebx, max         cmp     eax, ebx         jg      invalid      ; sum numbers     sum_nums:         mov     eax, sum         add     eax, num         mov     sum, eax         jmp     enter_num      ; calculate average     average_nums:         ; display total numbers         mov     edx, offset nums_message         call    writestring         mov     eax, ecx         call    writeint         call    crlf          ; display sum         mov     edx, offset sum_message         call    writestring         mov     eax, sum         call    writeint         call    crlf          ; display average         mov     edx, offset average_message         call    writestring         cdq         mov     eax, sum         mov     ebx, nums         div     ebx         call    writeint         call    crlf      exit; ; exit operating system main endp  ; insert additional procedures  end main


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