MongoDB C# Unique field giving error with values that don't exists -


so, i've field mongodb declared unique, reasons, if gives error after inserting second record, saying "unique" field used.

this code create index.

var tablenumber = new stringfielddefinition<table>("number"); var tablenumberindexdefinition = new indexkeysdefinitionbuilder<table>().ascending(tablenumber); tables.indexes.createoneasync(tablenumberindexdefinition, options);

this exception get: 

"a write operation resulted in error.\r\n  e11000 duplicate key error collection: restovationdb.tables index:number_1 dup key: { : null }]",

when insert first entity have no problems when try inserting second one, gives me exception above, ideas ?


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