Fix GH-15837: Segmentation fault in ext/simplexml/simplexml.c #15841
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We should check if the iterator data is still valid, because if it isn't, then the type info is UNDEF, but the pointer value may be dangling.
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We should check if the iterator data is still valid, because if it isn't, then the type info is UNDEF, but the pointer value may be dangling.