stuck at localhost

[magic vortex]

i followed every singel step but in the next js tutorial and all was working fine but at
1:47:01 rather than showing the website it showing local host and blank page and there is no error in the code but in terminal its showing this
#❓typescript

[wooden mango]

for that when the inital mapping starts it will be null according to the error

try categories?.map

this will render conditionally if the categories exists