NSString subStringToIndex gives EXC_BAD_ACCESS

FROM : Gregor Brandt
DATE : Fri Nov 09 23:45:32 2007

The following code snippet compiles fine but gives an bad access error 
on run....any ideas


      NSString *projectName;
      NSString *title = @"This is a test";

      // and parse the project name to remove the [TM] from the end
      NSUInteger realLength = title.length - 4;
      if ( realLength > 0 )
      {
          [projectName initWithString:[title 
substringToIndex:realLength]];
      }


Thanks

Gregor