Syntax error in Execute statement

Hello,

I created a function "coalescec" which behaves the
same as coalesce, but uses an integer and a string.
Now I'm getting an error in the folowing statements :

query := 'select "UID" from S_Users_To_Connection
where ConnID = ' || coalescec(conn_id,'null');
execute query into nUID;

ERROR: syntax error at or near "$2" at character 20
QUERY: SELECT $1 into $2

I have put UID in quotes because it seems to be a
keyword.

Here is the table script:

create TEMP table S_Users_To_Connection(
UID integer NOT NULL
,ConnID integer NOT NULL
,LoginID integer NOT NULL
);

Any suggestions ?

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