diff --git a/__init__.py b/__init__.py
index 7f8f939..4bf3bf6 100644
--- a/__init__.py
+++ b/__init__.py
@@ -12,7 +12,7 @@ logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger("DepthEstimation")
 
 # Version info
-__version__ = "1.3.3"
+__version__ = "1.3.6"
 
 # Node class mappings - will be populated based on dependency checks
 NODE_CLASS_MAPPINGS = {}
@@ -58,19 +58,20 @@ for module_name, min_version in required_dependencies.items():
 
 # Check optional DA3 dependencies
 for module_name, min_version in optional_dependencies.items():
+    module_version = None  # Initialize BEFORE try block to fix scoping issue
     try:
         module = __import__(module_name)
         module_version = getattr(module, "__version__", "0.0.0")
-        
+
         logger.info(f"Found optional {module_name} version {module_version}")
-        
+
     except ImportError:
         logger.info(f"Optional dependency {module_name} not installed. DA3 models will not be available.")
     except Exception as e:
         logger.warning(f"Error checking version for {module_name}: {e}. DA3 models might not work correctly.")
 
-    # Version comparison
-    if module_name == "depth_anything_3" and "module_version" in locals():
+    # Version comparison - now module_version is always defined
+    if module_name == "depth_anything_3" and module_version is not None:
         try:
             # Compare versions. This simple check works for "X.Y.Z" formats.
             if tuple(map(int, module_version.split('.'))) >= tuple(map(int, min_version.split('.'))):
diff --git a/depth_estimation_node.py b/depth_estimation_node.py
index f286a59..7e3acac 100644
--- a/depth_estimation_node.py
+++ b/depth_estimation_node.py
@@ -30,16 +30,21 @@ except ImportError:
     TIMM_AVAILABLE = False
     print("Warning: timm not available. Direct loading of Depth Anything models may not work.")
 
+# Get logger instance (basicConfig is called in __init__.py)
+logger = logging.getLogger("DepthEstimation")
+
 # Import DA3 availability status from the package's __init__
 from . import DA3_AVAILABLE
 
 # Conditionally import Depth Anything V3 if available
+# Use defensive import guard to handle edge cases where DA3_AVAILABLE check passes
+# but the actual import still fails (e.g., corrupted install, version mismatch)
 if DA3_AVAILABLE:
-    from depth_anything_3.api import DepthAnything3
-
-# Setup logging
-logging.basicConfig(level=logging.INFO)
-logger = logging.getLogger("DepthEstimation")
+    try:
+        from depth_anything_3.api import DepthAnything3
+    except ImportError as e:
+        DA3_AVAILABLE = False
+        logger.warning(f"DA3 import failed despite availability check: {e}. DA3 models disabled.")
 
 # Depth Anything V2 Implementation
 class DepthAnythingV2(nn.Module):
diff --git a/pyproject.toml b/pyproject.toml
index 6addd78..b56707b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [project]
 name = "comfyuidepthestimation"
 description = "A robust custom depth estimation node for ComfyUI using Depth-Anything models (V1, V2, and V3/DA3). It integrates depth estimation with configurable post-processing options including blur, median filtering, contrast enhancement, and gamma correction."
-version = "1.3.5"
+version = "1.3.6"
 license = { file = "LICENSE" }
 dependencies = [
     "transformers>=4.20.0",