Infinite loop in MySQL NX_ACCESS_ALLOWED

When calling NX_ACCESS_ALLOWED on a document that has no parentid but has a versionableid (a version having a proxy on it but whose base document has been deleted), an infinite loop is triggered.

In NX_ACCESS_ALLOWED in the while loop's first iteration, newid and curid are set to versionableid; then on the next iteration no line is found corresponding to this versionableid: SELECT parentid INTO newid FROM hierarchy WHERE hierarchy.id = curid returns and does nothing. newid and curid remains the same, resulting in a infinite loop.