How to supress the #ERROR-message?

[former_member318041]

I have a field [Gesammte Problemzeit], that displays the time between two timestamps.
[Gesammte Problemzeit] = [PRM Close time] - [PRM Open time]

If [PRM Close time] does not exist, I receive an error:

The error is correct, but I dont want it to be displayed in the resulting field.
How can I supress this error?

[amitrathi239 · Accepted solution]

use this.

=if(iserror([Gesammte Problemzeit])) then ""else [Gesammte Problemzeit]

[former_member318041 · Accepted solution]

Easy! - Thank you so much!