Server getTick()

[HipsterAF]

Issue description

When i start the server i get this error: Could not load level "survival": Return value of pocketmine\Server::getTick() must be of the type integer, null returned [19:48:41] [Server thread/CRITICAL]: TypeError: "Return value of pocketmine\Server::getTick() must be of the type integer, null returned" (EXCEPTION) in "/src/pocketmine/Server" at line 652 [19:48:41] [Server thread/INFO]: Preparing level "Mines"

Steps to reproduce the issue

1. load a world
2. ...

OS and versions

• PocketMine-MP: 789df94
• PHP: 7.0.3
• Server OS: Win10
• Game version: 1.1 McPE

Plugins

• Test on a clean server without plugins: is the issue reproducible without any plugins loaded? Yes

If the issue is not reproducible without plugins:

• Have you asked for help on our forums before creating an issue?
• Can you provide sample, minimal reproducing code for the issue? If so, paste it in the bottom section
• Paste your list of plugins here (use the 'plugins' command in PocketMine-MP)

Crashdump, backtrace or other files

• ...

[dktapps]

Please enable debug output and paste a backtrace.