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All SQLite error codes
SQLite error code

SQLITE_INTERNAL

SQLITE_INTERNAL is SQLite result code 2.

Result code2
NameSQLITE_INTERNAL
Primary codeSQLITE_INTERNAL

What it means

The SQLITE_INTERNAL result code indicates an internal malfunction. In a working version of SQLite, an application should never see this result code. If application does encounter this result code, it shows that there is a bug in the database engine.

This result code might be caused by a bug in SQLite. However, application-defined SQL functions or virtual tables, or VFSes, or other extensions can also cause this result code to be returned, so the problem might not be the fault of the core SQLite.

Source: SQLite Result and Error Codes