UnityEditor assembly referenced by third party DLL

We received a DLL from a client which is required for using their API. The problem is, the DLL produces the following error when building the project: ArgumentException: The Assembly UnityEditor.iOS.Extensions.Xcode is referenced by LEGOTracking ('Assets/LEGOSDKs/Tracking/LEGOTracking.dll'). But the dll is not allowed to be included or could not be found. UnityEditor.AssemblyHelper.AddReferencedAssembliesRecurse (System.String assemblyPath, System.Collections.Generic.List`1 alreadyFoundAssemblies, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary`2 cache, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:146) UnityEditor.AssemblyHelper.AddReferencedAssembliesRecurse (System.String assemblyPath, System.Collections.Generic.List`1 alreadyFoundAssemblies, System.String[] allAssemblyPaths, System.String[] foldersToSearch, System.Collections.Generic.Dictionary`2 cache, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:152) UnityEditor.AssemblyHelper.FindAssembliesReferencedBy (System.String[] paths, System.String[] foldersToSearch, BuildTarget target) (at C:/buildslave/unity/build/Editor/Mono/AssemblyHelper.cs:184) UnityEditor.HostView:OnGUI()

If I am understanding this correctly, we cannot build at all while using this DLL? Because it references the Editor assembly. Does any workarounds for this exist?