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SQLite error code

SQLITE_CONSTRAINT_NOTNULL

SQLITE_CONSTRAINT_NOTNULL is SQLite result code 1299, an extended code of SQLITE_CONSTRAINT.

Result code1299
NameSQLITE_CONSTRAINT_NOTNULL
Primary codeSQLITE_CONSTRAINT

What it means

The SQLITE_CONSTRAINT_NOTNULL error code is an extended error code for SQLITE_CONSTRAINT indicating that a NOT NULL constraint failed.

Source: SQLite Result and Error Codes