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recode_find_alias returns NULL when it cannot allocate a new symbol, but its result was dereferenced before being checked. The cleanup code that followed was also wrong: it deleted an alias (and its symbol) still referenced by the alias table and symbol list, and it unlinked the single step without decrementing number_of_singles, so that recode_delete_outer would later walk past the end of the list. Check the aliases before using them, leave them to the alias table, and keep number_of_singles consistent.
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recode_find_alias returns NULL when it cannot allocate a new symbol, but its result was dereferenced before being checked. The cleanup code that followed was also wrong: it deleted an alias (and its symbol) still referenced by the alias table and symbol list, and it unlinked the single step without decrementing number_of_singles, so that recode_delete_outer would later walk past the end of the list.
Check the aliases before using them, leave them to the alias table, and keep number_of_singles consistent.