--- behave/runner_util.py	2018-02-26 02:53:03.000000000 +1100
+++ /home/dion/Projects/IfcOpenShell/src/ifcblenderexport/patch-behave-runner_util.py	2021-03-21 11:58:29.777638958 +1100
@@ -381,7 +381,10 @@
     locals_["__file__"] = filename
     with open(filename, "rb") as f:
         # pylint: disable=exec-used
-        filename2 = os.path.relpath(filename, os.getcwd())
+        try:
+            filename2 = os.path.relpath(filename, os.getcwd())
+        except ValueError:
+            filename2 = filename
         code = compile(f.read(), filename2, "exec", dont_inherit=True)
         exec(code, globals_, locals_)