diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..b30f893
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,34 @@
+name: Python package
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: conda-incubator/setup-miniconda@v2
+        with:
+        auto-update-conda: true
+        python-version: ${{ matrix.python-version }}
+
+      - name: Install airss
+        shell: bash -el {0}
+        run: conda install -c conda-forge airss
+
+      - name: Install dependencies
+        shell: bash -el {0}
+        run: |
+          python -m pip install --upgrade pip
+          pip install ".[testing]"
+
+      - name: Test with pytest
+        shell: bash -el {0}
+        run: |
+          pytest
\ No newline at end of file
diff --git a/airsspy/build.py b/airsspy/build.py
index fcca05d..3975ea8 100644
--- a/airsspy/build.py
+++ b/airsspy/build.py
@@ -66,7 +66,6 @@ def generate(self, timeout=10, write_cell=None):
             bc_proc.kill()
             self.bc_out, self.bc_err = bc_proc.communicate()
             raise BuildcellError
-            return None
         else:
             bc_proc.kill()