diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 707572ed1fbb59ead3b8be91969bf73ebfc535db..6237cbe93a5253fddae646f417693f7013a5e389 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -10,7 +10,7 @@ test_job:
   # Create environment
   - pacman -Syu --noconfirm
   - pacman -S --noconfirm grep python
-  - pacman -S --noconfirm python-pythondialog python-pytest python-pytest-runner python-pytest-cov python-pylint python-isort mypy pylama python-mccabe python-requests
+  - pacman -S --noconfirm python-pytest python-pytest-runner python-pytest-cov python-pylint python-isort mypy pylama python-mccabe
   # Run tests
   - python setup.py test
   # Artifacts
diff --git a/src/forkedsubprocess/__init__.py b/src/forkedsubprocess/__init__.py
index 78ea6aa99021fabee54a9d8098d4836001249b7e..d43956377282134200502a104b4ffbf4b041c3be 100644
--- a/src/forkedsubprocess/__init__.py
+++ b/src/forkedsubprocess/__init__.py
@@ -1,10 +1,30 @@
+# Copyright (C) 2019, AllWorldIT.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy of
+# this software and associated documentation files (the "Software"), to deal in
+# the Software without restriction, including without limitation the rights to
+# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+# of the Software, and to permit persons to whom the Software is furnished to do
+# so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in all
+# copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+
 """Forked subprocesses support for Python."""
 
 import subprocess
 import threading
 from typing import IO, Any, Callable, Dict, List, Optional
 
-__version__ = '1.0.3'
+__version__ = '1.0.4'
 
 # Define our callback types
 InputCallback = Callable[[], str]
@@ -271,15 +291,19 @@ class ForkedSubprocess:
             raise ForkedSubprocessNotRunningException('wait() was called on a subprocess which is not running')
 
         # Stop writer
-        self._stdin_writer.stop()
+        if self._stdin_writer:
+            self._stdin_writer.stop()
 
         # Wait for process exit
         self._process.wait()
 
         # Wait for threads to read data and exit
-        self._stdin_writer.wait()
-        self._stdout_reader.wait()
-        self._stderr_reader.wait()
+        if self._stdin_writer:
+            self._stdin_writer.wait()
+        if self._stdout_reader:
+            self._stdout_reader.wait()
+        if self._stderr_reader:
+            self._stderr_reader.wait()
 
         return self._process.returncode