'DOSBox freezes on procedure which prints on screen the integer number from register AX, character by character

I wrote the procedure PRINTNR which divides sequentially the number in AX by 10, saves the rest on the stack. After the number in AX register becomes 0, I sequentially extract the digits from the stack, and add 30h in order to obtain the ascii code of the respective digit. Then I call the 02h function with INT 21h. When I assemble it, it freezes my DosBox.

CODE SEGMENT PARA 'CODE'
ASSUME CS: CODE

MAINPROC PROC FAR
    PUSH DS
    XOR AX, AX
    PUSH AX

    
    MOV AX, 5
    CALL PRINTNR
    
    RET
MAINPROC ENDP

PRINTNR PROC NEAR
    ;IN AX WE HAVE THE NUMBER
    MOV CX, 0
    MOV BX, 10
AGAIN:
    INC CX
    DIV BX
    PUSH DX
    MOV DX, 0
    CMP AX, 0
    JNE AGAIN

LOOPPRINT:
    POP DX
    ADD DL, 30h
    MOV AH, 02h
    INT 21h
    LOOP LOOPPRINT
    
    RET
PRINTNR ENDP

CODE ENDS   
END MAINPROC

Can you find out what's the problem?

assemblyx86-16


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