- SInt32 cls = [ITSendAEWithString(@"'----':obj { form:'prop', want:type('prop'), seld:type('pcls'), from:obj { form:'prop', want:type('prop'), seld:type('pTrk'), from:'null'() } }", 'core', 'getd', &savedPSN) int32Value];
+ NSAppleEventDescriptor *descriptor = ITSendAEWithString(@"'----':obj { form:'prop', want:type('prop'), seld:type('pcls'), from:obj { form:'prop', want:type('prop'), seld:type('pTrk'), from:'null'() } }", 'core', 'getd', &savedPSN);
+ if (descriptor == nil) {
+ return nil;
+ }
+ SInt32 cls = [descriptor int32Value];