django sqlite3 error

Hi these are my tables

music_name = char(username),userId(int)

meaning = char(meaning),userid(int)

i have used the join to merge this

db = sqlite3.connect('db.sqlite3')    cursor = db.cursor()      cursor.execute('\n'                           'INSERT INTO  music_result SELECT username, meaning ,NULL\n'                           'FROM music_name N JOIN music_sample1 T ON N.userid = T.userid \n')          db.commit()

when i tried to do this i got an error like

sqlite3.IntegrityError: datatype mismatch

please do help me to solve this error

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