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[custom build 20040607, JDK 1.5.0 b51a] I closed project where I did some edits in project build.xml, couple seconds after that I clicked GC and got NullPointerExc.
Created attachment 15524 [details] exc stack trace
Huh, looks like you managed to get removeNotify called on the children at the exact wrong time.
Cannot reproduce, but maybe this will fix it: committed Up-To-Date 1.7 ant/src/org/apache/tools/ant/module/nodes/AntProjectChildren.java
Cannot reproduce, hopefully fixed. Verified in dev-200406230100.