Abstract method in PHP 7.0.1

Upgrading to PHP 7.01 (32-bit) together with Apache 2.4.18 on a Windows  
Server 2012, I get the following PHP error log:

---
[Sun Jan 03 11:52:18.582829 2016] [:error] [pid 12604:tid 1092] [client  
93.132.169.26:64219] PHP Fatal error: Class wbb\\data\\thread\\ThreadList  
contains 1 abstract method and must therefore be declared abstract or  
implement the remaining methods (SeekableIterator::C:\\php) in  
C:\\Websites\\zeta-producer.com\\community\\lib\\data\\thread\\ThreadList.class.php  
on line 15
---

This happens inside a community software called "Woltlab Burning Board  
4.1" (WBB).

The vendor claims that this is a bug in my PHP version, since  
"SeekableIterator::C:\\php" is not a valid method name.

Can anyone give me some hints about this? Is it really a bug in PHP and  
not in WBB?

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