ORA-05758
illegal character code in column "string"
Cause
The specified blockchain table column contained a byte sequence that could not be interpreted as a valid character code in the column's character set. The character set of the column is either the database or the national (NCHAR) character set. Note that Unicode noncharacters, such as U+FFFE and U+FFFF, are considered illegal in Unicode character sets AL32UTF8, AL16UTF16 and UTF8.
Action
Clean up character data before trying to insert it into the database.