diff --git a/pyrelacs/repros/repros.py b/pyrelacs/repros/repros.py
index 11c657f..3067e09 100644
--- a/pyrelacs/repros/repros.py
+++ b/pyrelacs/repros/repros.py
@@ -8,9 +8,9 @@ import nixio as nix
 import importlib.util
 
 from pyrelacs.util.logging import config_logging
+
 log = config_logging()
 
-from IPython import embed
 
 class Repro:
     """
@@ -25,7 +25,6 @@ class Repro:
     def run_repro(
         self, nix_file: nix.File, name: str, file: pathlib.Path, *args, **kwargs
     ) -> None:
-
         spec = importlib.util.spec_from_file_location("rep", file)
         if not spec:
             log.error("Could not load the file")
@@ -35,7 +34,10 @@ class Repro:
                 log.error("Could not load the module of the repro")
             else:
                 sys.modules[name] = module
-                spec.loader.exec_module(module)
+                if spec.loader is not None:
+                    spec.loader.exec_module(module)
+                else:
+                    log.error(f"{spec.loader} is None")
                 if hasattr(module, name):
                     rep_class = getattr(module, name)
                     rep_class.run(nix_file)