[antlr-interest] Tree walk exception

[Eugene Seliverstov]

Hello!

Sometimes during work of tree grammar parser NullPointerException is thrown.
Exception happens at "org.antlr.runtime.tree.CommonTr
eeNodeStream.walkBackToMostRecentNodeWithUnvisitedChildren(
CommonTreeNodeStream.java :483)" and caused by accessing null element at top
of stack indexStack.
This can appear unexpectedly on different rules, on different input texts. I
think sometimes it's because small lookahead or disambiguation of
 grammar rules, but why it's no detected at code generation time?..

Of course, I can provide grammars if it can help (they are too large to post
here).
Version of antlr - 3.0b5.

Thank you for regards!
-- 
Best regards,
Eugene Seliverstov
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