All opamps have off set voltage at the output. Does this mean that it is never ok to cascade op amp stages?
No, it's often okay to cascade op-amp filter stages.


Op-amps can be chosen to have very low offset voltages. Input-referred offsets can be on the order of microvolts.
Filters are often designed with low (or unity) dc gain, so the output offset is not much larger than the input referred offset voltage.
The offset voltage from device to device is not correlated (assuming they are not multiple op-amps on the same chip). So the typical offset only grows from stage to stage according to the root-of-sum-of-squares of the offsets of the individual stages. 

Of course, the temperature drift of the offset might all be the same if you build your stages with the same op-amp type. If that's a concern you might want to use an inverting design so that the drift of each two stages is likely to cancel each other.