diff --git a/llama_stack/cli/stack/build.py b/llama_stack/cli/stack/build.py
index 2b5b432c8..ceed53e82 100644
--- a/llama_stack/cli/stack/build.py
+++ b/llama_stack/cli/stack/build.py
@@ -101,7 +101,7 @@ class StackBuild(Subcommand):
             )
         else:
             build_dir = (
-                Path(os.getenv("CONDA_PREFIX")).parent
+                Path(os.getenv("CONDA_PREFIX", "")).parent
                 / f"llamastack-{build_config.name}"
             )
 
diff --git a/llama_stack/cli/stack/configure.py b/llama_stack/cli/stack/configure.py
index 5b1fbba86..ccf0d94f0 100644
--- a/llama_stack/cli/stack/configure.py
+++ b/llama_stack/cli/stack/configure.py
@@ -67,7 +67,7 @@ class StackConfigure(Subcommand):
         )
         if os.getenv("CONDA_PREFIX"):
             conda_dir = (
-                Path(os.getenv("CONDA_PREFIX")).parent / f"llamastack-{args.config}"
+                Path(os.getenv("CONDA_PREFIX", "")).parent / f"llamastack-{args.config}"
             )
             build_config_file = Path(conda_dir) / f"{args.config}-build.yaml"