diff --git a/CHANGELOG.md b/CHANGELOG.md
index eb7e93d7c..cbe0ea672 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+### 43.4.3 [#1341](https://github.com/openfisca/openfisca-core/pull/1341)
+
+#### Technical changes
+
+- Add a check for creating a simulation when building a test
+
 ### 43.4.2 [#1336](https://github.com/openfisca/openfisca-core/pull/1336)
 
 #### Technical changes
diff --git a/openfisca_core/tools/test_runner.py b/openfisca_core/tools/test_runner.py
index f04d4b585..7012e5122 100644
--- a/openfisca_core/tools/test_runner.py
+++ b/openfisca_core/tools/test_runner.py
@@ -239,7 +239,11 @@ def runtest(self) -> None:
         try:
             builder.set_default_period(period)
             self.simulation = builder.build_from_dict(self.tax_benefit_system, input)
-        except (VariableNotFound, SituationParsingError):
+            assert (
+                self.simulation is not None
+            ), "Simulation should be properly initialized, Check your test input"
+
+        except (VariableNotFound, SituationParsingError, AssertionError):
             raise
         except Exception as e:
             error_message = os.linesep.join(
diff --git a/setup.py b/setup.py
index 2ecf68cf8..512162ec2 100644
--- a/setup.py
+++ b/setup.py
@@ -70,7 +70,7 @@
 
 setup(
     name="OpenFisca-Core",
-    version="43.4.2",
+    version="43.4.3",
     author="OpenFisca Team",
     author_email="contact@openfisca.org",
     classifiers=[