diff --git a/lib/appsignal/check_in/scheduler.ex b/lib/appsignal/check_in/scheduler.ex
index fe8d5db5a..ae2b4245c 100644
--- a/lib/appsignal/check_in/scheduler.ex
+++ b/lib/appsignal/check_in/scheduler.ex
@@ -120,7 +120,7 @@ defmodule Appsignal.CheckIn.Scheduler do
   end
 
   @impl true
-  def terminate(_reason, %{events: events}) when length(events) > 0 do
+  def terminate(_reason, %{events: [_ | _] = events}) do
     # If any events are stored, attempt to transmit them before the
     # process is terminated.
     handle_continue({:transmit, events}, initial_state())
diff --git a/test/appsignal/error_test.exs b/test/appsignal/error_test.exs
index b1c505578..8a4e3b59b 100644
--- a/test/appsignal/error_test.exs
+++ b/test/appsignal/error_test.exs
@@ -21,7 +21,7 @@ defmodule Appsignal.ErrorTest do
     test "format's the error's stack trace", %{metadata: metadata} do
       {_name, _message, stack} = metadata
       assert is_list(stack)
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
       assert Enum.all?(stack, &is_binary(&1))
     end
   end
@@ -46,7 +46,7 @@ defmodule Appsignal.ErrorTest do
     test "format's the error's stack trace", %{metadata: metadata} do
       {_name, _message, stack} = metadata
       assert is_list(stack)
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
       assert Enum.all?(stack, &is_binary(&1))
     end
   end
@@ -73,7 +73,7 @@ defmodule Appsignal.ErrorTest do
     test "format's the error's stack trace", %{metadata: metadata} do
       {_name, _message, stack} = metadata
       assert is_list(stack)
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
       assert Enum.all?(stack, &is_binary(&1))
     end
   end
@@ -101,7 +101,7 @@ defmodule Appsignal.ErrorTest do
     test "format's the error's stack trace", %{metadata: metadata} do
       {_name, _message, stack} = metadata
       assert is_list(stack)
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
       assert Enum.all?(stack, &is_binary(&1))
     end
   end
@@ -126,7 +126,7 @@ defmodule Appsignal.ErrorTest do
     test "format's the error's stack trace", %{metadata: metadata} do
       {_name, _message, stack} = metadata
       assert is_list(stack)
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
       assert Enum.all?(stack, &is_binary(&1))
     end
   end
diff --git a/test/appsignal/stacktrace_test.exs b/test/appsignal/stacktrace_test.exs
index 7fa9507a9..a85286743 100644
--- a/test/appsignal/stacktrace_test.exs
+++ b/test/appsignal/stacktrace_test.exs
@@ -14,7 +14,7 @@ defmodule Appsignal.StacktraceTest do
     end
 
     test "does not return an empty list", %{stack: stack} do
-      assert length(stack) > 0
+      refute Enum.empty?(stack)
     end
 
     test "returns a stacktrace containing the error", %{