Runtime Error: empty String, i'm tryna make bar chart with values from firebase realtime database but always fail. Can you guys help me solve it

[Ikhwan_Hana]

[Still-learning (1-2-3-4...)]

Make sure whether you get return value from firebase or not?

[havhamapps (HavHam)]

use if not value=""
create bar chart

[Ikhwan_Hana]

sorry,
i already found it