Filtering throws exception

[benhaynes]

From directus created by michaelbriordan : directus/directus#2178

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Version Info

• Directus version and branch (Or commit hash): 6.4.0
• PHP version: 7.1.9
• MySQL version: 10.1.31-MariaDB
• Web server: (Ex. Apache, nginx or IIS?) Apache 2.4.27
• OS name and version: CentOS Linux release 7.4.1708 (Core)

Expected Behavior

HTTP/1.1 200 OK
Date: Thu, 12 Jul 2018 13:21:17 GMT
Server: CentOS WebPanel: Protected by Mod Security
X-Powered-By: PHP/7.1.9
Cache-Control: no-store,no-cache,must-revalidate
Connection: close
Transfer-Encoding: chunked
Content-Type: application/json; charset=utf-8

{"meta":{"table":"EDITIONS","type":"item"},"data":{"id":126,"Year":1603,"Title":"...

Actual Behavior

500 Internal Server Error

Steps to Reproduce

Call API on multiple platforms. Tried Paw, browser, cURL and PHP (with/without Guzzle).

The HTTP request sent was:
GET /api/1.1/tables/EDITIONS/rows?filters%5BDate%5D%5Beq%5D=1603 HTTP/1.1

Paw automatically encodes '[' and ']' - I have tried it in the browser with '[' and ']'

Authorization: Basic * * * *
Cookie: PHPSESSID=dv2u2340v6ov96n4iri8biu39i
Host: directus.michaelriordan.uk
Connection: close
User-Agent: Paw/3.1.7 (Macintosh; OS X/10.13.5) GCDHTTPRequest

Schema Dump, Logs, or Screenshots

tail apache error_log:
[internal function]: Directus\Database\TableGateway\RelationalTableGateway->processFilters(Object(Directus\Database\Query\Builder), Array) in /home/mbr50/cms/directus/api/core/Directus/Database/TableGateway/RelationalTableGateway.php on line 1171