I have a proc to store stored procedure usage stats but am encountering issues using merge statement:

ALTER PROCEDURE [dbo].[ProcedureUsageStats]
AS
BEGIN
    DECLARE @command NVARCHAR(MAX)

    SET @command = '
    USE [?];
    MERGE [Db1].[dbo].[table1] AS target
    USING (
        SELECT 
            db_name() AS DataBaseName,
            v.object_id AS Object_ID,
            v.name AS StroredProcName,
            v.create_date,
            v.modify_date,
            ps.last_execution_time AS LastExecutionTime,
            v.type,
            v.type_desc
        FROM 
            sys.procedures v
        LEFT JOIN 
            sys.dm_exec_procedure_stats ps
            ON v.object_id = ps.object_id
    ) AS source
    ON (target.Object_ID = source.Object_ID)

    -- If the stored procedure doesn''t exist in the target table, insert it
    WHEN NOT MATCHED BY TARGET THEN
        INSERT ([DataBaseName], [Object_ID], [StroredProcName], [create_date], [modify_date], [LastExecutionTime], [type], [type_desc])
        VALUES (source.DataBaseName, source.Object_ID, source.StroredProcName, source.create_date, source.modify_date, source.LastExecutionTime, source.type, source.type_desc)

    -- If the stored procedure exists in the target table and source.LastExecutionTime is not NULL, update the LastExecutionTime
    WHEN MATCHED AND source.LastExecutionTime IS NOT NULL THEN
        UPDATE SET 
            target.LastExecutionTime = source.LastExecutionTime;
    '

    EXEC sp_MSforeachdb @command;
END;

I am then getting the error below:
Msg 8672, Level 16, State 1, Line 20
The MERGE statement attempted to UPDATE or DELETE the same row more than once. This happens when a target row matches more than one source row. A MERGE statement cannot UPDATE/DELETE the same row of the target table multiple times. Refine the ON clause to ensure a target row matches at most one source row, or use the GROUP BY clause to group the source rows.

There are duplicate object_IDs

What am I missing?