Probleme mit Dezimalzahl

PDOException: SQLSTATE[HY000]:
General error: 1366 Incorrect decimal value:
'' for column 'field_reihe_value' at row 1:
INSERT INTO {field_data_field_reihe} (entity_type, entity_id, revision_id, bundle, delta, language, field_reihe_value) VALUES (:db_insert_placeholder_0, :
db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6);

Array ( [:db_insert_placeholder_0] => node [:db_insert_placeholder_1] => 262 [:db_insert_placeholder_2] => 262 [:db_insert_placeholder_3] =>
team [:db_insert_placeholder_4] => 0 [:db_insert_placeholder_5] => und [:db_insert_placeholder_6] => )

in field_sql_storage_field_storage_write()(Zeile 451 von /domain/modules/field/modules/field_sql_storage/field_sql_storage.module).