diff --git a/LibGit2Sharp/SmartSubtransportStream.cs b/LibGit2Sharp/SmartSubtransportStream.cs
index 008d1fcd0..247e90f34 100644
--- a/LibGit2Sharp/SmartSubtransportStream.cs
+++ b/LibGit2Sharp/SmartSubtransportStream.cs
@@ -119,6 +119,10 @@ private static int SetError(SmartSubtransportStream stream, Exception caught)
                 {
                     errorCode = ((NativeException)ret).ErrorCode;
                 }
+                else
+                {
+                    Proxy.git_error_set_str(GitErrorCategory.Unknown, caught);
+                }
 
                 return (int)errorCode;
             }