Cursor for loop

[PeteCreme]

I'm getting errors migrating a simple cursor for loop.
The setup is python 3.6 on rhel 7.6 with a virtual environment (venv), so that I could load the modules.
The source is:

DECLARE
cursor c1 is
select name
from employees
order by name;
BEGIN
for r1 in c1 loop
dbms_output.put_line(r1.name);
end loop;
END;
/

The output is:

(priscilla) [:/opt/git/priscilla ]$ make migrate
python3 lib/S2S.py /opt/git/priscilla/input/ccr.pkg /opt/git/priscilla/output/ccr.py
Traceback (most recent call last):
File "lib/S2S.py", line 37, in
main(sys.argv)
File "lib/S2S.py", line 23, in main
node = tree.accept(visitor)
File "./built/PlSqlParser.py", line 7324, in accept
return visitor.visitSql_script(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 43, in visitSql_script
body = self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 7541, in accept
return visitor.visitUnit_statement(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 52, in visitUnit_statement
ret = self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 32606, in accept
return visitor.visitAnonymous_block(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 59, in visitAnonymous_block
return self.visitBody(ctx)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 220, in visitBody
ret = self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 34570, in accept
return visitor.visitSeq_of_statements(self)
File "./built/PlSqlParserVisitor.py", line 1394, in visitSeq_of_statements
return self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 34757, in accept
return visitor.visitStatement(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 286, in visitStatement
ret = self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 35423, in accept
return visitor.visitLoop_statement(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 292, in visitLoop_statement
ret = self.visitChildren(ctx)
File "/opt/python_venv/priscilla/lib64/python3.6/site-packages/antlr4/tree/Tree.py", line 44, in visitChildren
childResult = c.accept(self)
File "./built/PlSqlParser.py", line 35534, in accept
return visitor.visitCursor_loop_param(self)
File "/opt/git/priscilla/lib/ScriptVisitor.py", line 310, in visitCursor_loop_param
target = ctx.index_name().getText().upper()
AttributeError: 'NoneType' object has no attribute 'getText'
make: *** [/opt/git/priscilla/output/ccr.py] Error 1

Any help appreciated thanks.