r - invalid factor level, NA generated when I try to add row to dataframe with var1 and Freq -

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i have data frame, head of is:

head(loss_freq_table)    var1 freq 1 1101   19 2 1102   18 3 1103   12 4 1104   19 5 1105   16 6 1106   12

however, when type loss_by_team<-rbind(loss_by_team, data.frame(var1=1455, freq=0)), error

warning message:  in `[<-.factor`(`*tmp*`, ri, value = 1455) :    invalid factor level, na generated

and when type loss_by_team[which(loss_by_team$var1=="1455"), ], get

[1] var1 freq <0 rows> (or 0-length row.names)

anyone know why is?


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