diff --git a/liccheck/command_line.py b/liccheck/command_line.py
index 3dc2e4a..638307a 100644
--- a/liccheck/command_line.py
+++ b/liccheck/command_line.py
@@ -73,6 +73,11 @@ def from_pyproject_toml(cls):
         def elements_to_lower_str(lst):
             return [str(_).lower() for _ in lst]
 
+        conf_keys = {"authorized_licenses", "unauthorized_licenses",
+                     "authorized_packages"}
+        if not set(liccheck_section.keys()) & conf_keys:
+            raise NoValidConfigurationInPyprojectToml
+
         strategy = cls(
             authorized_licenses=elements_to_lower_str(
                 liccheck_section.get("authorized_licenses", [])
diff --git a/tests/test_read_strategy.py b/tests/test_read_strategy.py
index a7de307..e219371 100644
--- a/tests/test_read_strategy.py
+++ b/tests/test_read_strategy.py
@@ -28,6 +28,11 @@ def test_falls_back_to_strategy_if_no_liccheck_section_in_pyproject_toml(self):
         with pytest.raises(NoValidConfigurationInPyprojectToml):
             Strategy.from_pyproject_toml()
 
+    @pytest.mark.usefixtures("pyproject_toml_with_liccheck_section_without_licenses_in_cwd")
+    def test_falls_back_to_strategy_if_liccheck_section_in_pyproject_toml_has_no_licenses(self):
+        with pytest.raises(NoValidConfigurationInPyprojectToml):
+            Strategy.from_pyproject_toml()
+
     @pytest.mark.usefixtures("pyproject_toml_with_liccheck_section_in_cwd")
     def test_with_liccheck_section_in_pyproject_toml(self):
         strategy = Strategy.from_pyproject_toml()
@@ -58,6 +63,17 @@ def empty_pyproject_toml_in_cwd(self, tmpdir):
         yield
         os.chdir(cwd)
 
+    @pytest.fixture
+    def pyproject_toml_with_liccheck_section_without_licenses_in_cwd(self, empty_pyproject_toml_in_cwd):
+        with open("pyproject.toml", "w") as file:
+            file.write(
+                """
+                [tool.liccheck]
+                # No licenses are defined here, just point to the strategy file.
+                strategy_ini_file = "./liccheck.ini"
+                """
+            )
+
     @pytest.fixture
     def pyproject_toml_with_liccheck_section_in_cwd(self, empty_pyproject_toml_in_cwd):
         with open("pyproject.toml", "w") as file: