Why does the LCD hangs when it prints negative numbers in the form -xxxx?

[M7890.1]

The LCD hangs when it prints negative numbers lesser than -999, or more specifically, the whole program hangs. Does anyone know the reason for this? I have attached my code below.

(The code is too long to be pasted here, I attached the file.)

[Tesla DeLorean · Accepted solution]

Try making the buffer big enough to hold all the characters and a trailing NUL

char lcd_data[8]; // try 16

[M7890.1]

Tried that and solved my problem. Thanks!