EXC_BAD_ACCESS on line 65 of KWSpec.m

[aleufms]

Memory error when tried to do this:
id string = @"";
[string stub:@selector(stringByAppendingString:) andReturn:@"abc" withArguments:@"def"];
[[[string stringByAppendingString:@"de"] should] equal:@"abc"];

Using 2.2.3 version and XCTest subspec with Xcode 5.1 (5B45j)