The if statement is not right in the conditional part

[Celthi]

The if part that if [expression]; then should be if [ expression ]; then. There must be space after [ and before ]see the link

And it will be better if there is an example given.

[lhoursquentin]

The brackets should actually be removed entirely as the if syntax is if command; then where command can be anything like ls or tree for instance, if executes the command and branches into the if body if the latter returns 0 or in the else/elif body for any other return value.
This should not be restricted to the use of [ that is a builtin (and an equivalent to test) often used in condition but all in all remains a simple command.

[Celthi]

Yeah, you are right. Maybe you can fix the error.