Closed Unassigned: A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll [108]

I'm not able to get over @Styles.Render("~/Content/style-bundle") (VisualStudio hangs there...)

Only way how to continue in debugging is stop and then attach to w3wp process.

Here's debug output:

A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in IronRuby.Libraries.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll
A first chance exception of type 'IronRuby.Builtins.KernelOps.ThrowCatchUnwinder' occurred in Microsoft.Dynamic.dll

BundleTransformer.Core: 1.9.52
BundleTransformer.SassAndScss: 1.9.64