NULL textptr (text, ntext, or image pointer) passed to %ls function.

Error Message:
Msg 7133, Level 16, State 1, Line 5
NULL textptr (text, ntext, or image pointer) passed to %ls function.

Severity level:
16.

Description:
This error message appears when you try to pass a NULL pointer to the READTEXT or WRITETEXT function.

Consequences:
The T-SQL statement can be parsed, but causes the error at runtime.

Resolution:
Errors of the Severity Level 16 are generated by the user and are corrigible by the user. The statement cannot be executed this way. The pointer must have a valid value.

Versions:
All versions of SQL Server.

Example(s):
USE pubs
DECLARE @textpointer VARBINARY(16)
SELECT TEXTPTR(pr_info)
  FROM pub_info
READTEXT pub_info.pr_info @textpointer 1 25

Remarks:
In the above example we try to pass the variable @textpointer to the READTEXT function. Because the variable has only been declared but no value assigned to it, it contains a NULL and the error is raised.