On opening PackageManager Window after creating 3D TMP - Text throws "OverflowException"

Steps to Reproduce:

1. Create a new Project
2. Hierarchy > right-click > 3D > Text - TextMeshPro
3. Window > Package Manager

Expected Result: Package Manager should open without any error

Actual Result: "OverflowException" is thrown

Reproducible on: 2019.3.0a8

Working Fine: 2019.3.0a7, 2019.2.0b9

Environment: Windows10 only

Stack Trace: OverflowException: Value was either too large or too small for a character.
System.Convert.ToChar (System.Int32 value) (at <a8ed250850854b439cedc18931a314fe>:0)
UnityEditor.Json+Parser.get_PeekChar () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.Json+Parser.EatWhitespace () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.Json+Parser.get_NextToken () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.Json+Parser.ParseValue () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.Json+Parser.Parse (System.String jsonString) (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.Json.Deserialize (System.String json) (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.PackageManager.UI.AssetStore.AssetStoreClient+AssetStoreClientInternal.List (System.Int32 offset, System.Int32 limit) (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.PackageManager.UI.PackageDatabase+PackageDatabaseInternal.Refresh (UnityEditor.PackageManager.UI.RefreshOptions options) (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.PackageManager.UI.PackageManagerWindow.RefreshDatabase () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.PackageManager.UI.PackageManagerWindow.OnEnable () (at <f68ca06da1c243afa30519f1c09ba13a>:0)
UnityEditor.PackageManager.UI.PackageManagerWindow:ShowPackageManagerWindow(MenuCommand)