Calendar format: Undefined property: StubObject::$mFirstCall

[kghbln]

Setup

• MediaWiki | 1.34.0-rc.1 (2dfeefe)17:58, 6 November 2019
• PHP | 7.2.24-0ubuntu0.18.04.1 (apache2handler)
• MariaDB | 10.1.41-MariaDB-0ubuntu0.18.04.1
• Semantic MediaWiki | 3.2.0-alpha (9fbcced) 11:38, 6 November 2019
• Semantic Result Formats | 3.2.0-alpha (1b98376) 18:41, 31 October 2019

Issue

When using the calendar format on a page the following issue is emitted:

Notice: Undefined property: StubObject::$mFirstCall in /../w/extensions/SemanticResultFormats/formats/calendar/SRF_Calendar.php on line 323

See sandbox