diff --git a/docker-compose.yaml b/docker-compose.yaml
index 8dd3ecc..e7821e2 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -2,7 +2,11 @@ version: "3"
 services:
   bigtable-emulator:
     image: shopify/bigtable-emulator
-    command: ["-cf", "dev.test.cf1,dev.test.cf2,dev.test.otherFamily"]
+    command:
+      [
+        "-cf",
+        "dev.test.cf1,dev.test.cf2,dev.test.otherFamily,dev.dev.cf1,dev.dev.cf2,dev.dev.otherFamily",
+      ]
     ports:
       - "9035:9035"
     expose:
diff --git a/lib/operations/mutate_row.ex b/lib/operations/mutate_row.ex
index dcf8b48..8cbc7d5 100644
--- a/lib/operations/mutate_row.ex
+++ b/lib/operations/mutate_row.ex
@@ -39,15 +39,22 @@ defmodule Bigtable.MutateRow do
 
     connection = Connection.get_connection()
 
-    {:ok, stream, _} =
+    result =
       connection
       |> Bigtable.Stub.mutate_row(request, metadata)
 
-    result =
-      stream
-      |> Utils.process_stream()
+    case result do
+      {:ok, stream, _} ->
+        stream
+        |> Utils.process_stream()
+        |> List.first()
+
+      {:error, error} when is_map(error) ->
+        {:error, Map.get(error, :message, "unknown error")}
 
-    {:ok, result}
+      _ ->
+        {:error, "unknown error"}
+    end
   end
 
   @spec mutate(V2.MutateRowsRequest.Entry.t()) :: V2.MutateRowResponse.t()
diff --git a/lib/operations/mutate_rows.ex b/lib/operations/mutate_rows.ex
index fe4e7de..e3d8283 100644
--- a/lib/operations/mutate_rows.ex
+++ b/lib/operations/mutate_rows.ex
@@ -41,15 +41,22 @@ defmodule Bigtable.MutateRows do
 
     metadata = Connection.get_metadata()
 
-    {:ok, stream, _} =
+    result =
       connection
       |> Bigtable.Stub.mutate_rows(request, metadata)
 
-    result =
-      stream
-      |> Utils.process_stream()
+    case result do
+      {:ok, stream, _} ->
+        stream
+        |> Utils.process_stream()
+        |> List.first()
+
+      {:error, error} when is_map(error) ->
+        {:error, Map.get(error, :message, "unknown error")}
 
-    {:ok, result}
+      _ ->
+        {:error, "unknown error"}
+    end
   end
 
   @spec mutate([Google.Bigtable.V2.MutateRowsRequest.Entry.t()]) :: {:ok, [any()]}
diff --git a/test/row_filter/row_filter_integration_test.exs b/test/row_filter/row_filter_integration_test.exs
index e68d8c4..24e2bd3 100644
--- a/test/row_filter/row_filter_integration_test.exs
+++ b/test/row_filter/row_filter_integration_test.exs
@@ -463,6 +463,8 @@ defmodule RowFilterIntegration do
       |> Mutations.set_cell("cf2", "column1", "value3", 4000)
       |> MutateRow.build()
       |> MutateRow.mutate()
+
+    :ok
   end
 
   defp seed_range(row_key) do
@@ -475,6 +477,8 @@ defmodule RowFilterIntegration do
       |> Mutations.set_cell("cf1", "column5", "value5")
       |> MutateRow.build()
       |> MutateRow.mutate()
+
+    :ok
   end
 
   defp seed_values(context) do
@@ -484,6 +488,8 @@ defmodule RowFilterIntegration do
         |> Mutations.set_cell("cf1", "column", "value")
         |> MutateRow.build()
         |> MutateRow.mutate()
+
+      :ok
     end)
   end