Hasura doesn't respond because of variable

### Version Information

Server Version:
CLI Version (for CLI related issue): 1.3.3

### Environment

Cloud

### What is the expected behaviour?

return data

### Keywords

query
doesn't respond

### What is the current behaviour?

I have a table "user". I've created a query (for demo) to show the error i have right now.
If i provide "b" variable at the top of "query variables" the hasura doens't respond (i've noticed that it happends because of "`%" symbols together).

But if i just change order of variables everythng is working fine.

### How to reproduce the issue?

1.
2.
3.

### Screenshots or Screencast

### Please provide any traces or logs that could help here.

### Any possible solutions?

### Can you identify the location in the source code where the problem exists?

### If the bug is confirmed, would you be willing to submit a PR?