Batch SQL Command Fails

I wanted to insert a record into Another_Class if Check_Class exists and I wrote the following batch SQL command but it failed with the error below. I have used the next line character (\n) around the IF as required in doc 3.0.x but it is still not working.

session.command("LET $a = (SELECT from V WHERE @class = 'Check_Class' limit 1); \n if($a.size() = 0) { \n INSERT INTO CLASS Another_Class SET name = 'test'; \n }");

xxxxxxxxxxx ERROR xxxxxxxxxxxxxxxxxxxxxx
Exception in thread "main" com.orientechnologies.orient.core.sql.OCommandSQLParsingException: Error parsing query:
LET $a = (SELECT from V WHERE @class = 'Check_Class' limit 1);
if($a.size() = 0) {
^
INSERT INTO CLASS Another_Class SET name = 'test';
} 
Encountered " "if "" at line 2, column 2.
Was expecting:

Start by comparing the batch SQL example in the referenced 3.0.x documentation with the command and parser error shown here. Reproduce the command if the relevant OrientDB setup is available, then verify whether the documentation or the reported syntax is incorrect. Done means the documented example matches supported behavior or clearly explains the limitation.