diff --git a/tested/judge/utils.py b/tested/judge/utils.py
index 19d50002..1daedef0 100644
--- a/tested/judge/utils.py
+++ b/tested/judge/utils.py
@@ -34,6 +34,7 @@ def run_command(
     timeout: float | None,
     command: list[str] | None = None,
     stdin: str | None = None,
+    check: bool = False,
 ) -> BaseExecutionResult | None:
     """
     Run a command and get the result of said command.
@@ -42,6 +43,7 @@ def run_command(
     :param command: Optional, the command to execute.
     :param stdin: Optional stdin for the process.
     :param timeout: The max time for this command.
+    :param check: Raise if the command fails.
 
     :return: The result of the execution if the command was not None.
     """
@@ -58,6 +60,7 @@ def run_command(
             capture_output=True,
             input=stdin,
             timeout=timeout,
+            check=check,
         )
     except subprocess.TimeoutExpired as e:
         return BaseExecutionResult(
diff --git a/tested/languages/javascript/config.py b/tested/languages/javascript/config.py
index 1a8ed379..307d5f4b 100644
--- a/tested/languages/javascript/config.py
+++ b/tested/languages/javascript/config.py
@@ -126,18 +126,16 @@ def modify_solution(self, solution: Path):
         assert self.config
 
         parse_file = str(Path(__file__).parent / "parseAst.js")
-        try:
-            output = run_command(
-                solution.parent,
-                timeout=None,
-                command=["node", parse_file, str(solution.absolute())],
-            )
-            if output:
-                namings = output.stdout.strip()
-                with open(solution, "a") as file:
-                    print(f"\nmodule.exports = {{{namings}}};", file=file)
-        except TimeoutError:
-            pass
+        output = run_command(
+            solution.parent,
+            timeout=None,
+            command=["node", parse_file, str(solution.absolute())],
+            check=True,
+        )
+        assert output, "Missing output from JavaScript's modify_solution"
+        namings = output.stdout.strip()
+        with open(solution, "a") as file:
+            print(f"\nmodule.exports = {{{namings}}};", file=file)
 
         # Add strict mode to the script.
         with open(solution, "r") as file: