Just an FYI... Never received this error over the past several years and just received the same error from a different customer opening a different form that also had a toolbar. Not sure when it may have started, but somewhat recently. We had 11.0.0.1 in production for about 2 weeks before updating to 11.0.1.0 for about 2 weeks. Then updated to 11.0.3.0 for less than a week where we now how two instances of the same error. So it is hard to say exactly which version it started on due to the short periods for each version in the field, but I'm guessing either 11.0.2.0. or 11.0.3.0.
I'm wondering if it is related to another ticket about positioning of the toolbars at Windows scaling > 100% even though it is something we've been doing for years but never had this argument out of range error in the past.
TAdvToolbar TAdvDockPanel positioning issue at display scaling > 100% - VCL / TMS VCL UI Pack - TMS Support Center (tmssoftware.com)