diff --git a/src/bitstream_programmer.py b/src/bitstream_programmer.py
index 16bc941..3ac8a8c 100644
--- a/src/bitstream_programmer.py
+++ b/src/bitstream_programmer.py
@@ -175,7 +175,9 @@ def program_bitstream(
         return _program_with_xsct(xsct, bit_path, callback, ps7_tcl, timeout)
 
     # Fallback to Vivado
-    vivado = _get_vivado_path(config.vitis_path)
+    vivado = _get_vivado_path(
+        config.vitis_path if hasattr(config, 'vitis_path') else ""
+    )
     if vivado:
         return _program_with_vivado(vivado, bit_path, callback)
 
diff --git a/src/gui/widgets.py b/src/gui/widgets.py
index cf612fb..3d52e5e 100644
--- a/src/gui/widgets.py
+++ b/src/gui/widgets.py
@@ -32,8 +32,8 @@ from gui.styles import (
     ACCENT_ERROR,
     ACCENT_DISABLED,
     CONNECTOR_COLOR,
-    DARK_CARD,
     DARK_FG,
+    DARK_CARD,
     CIRCLE_PENDING,
     CIRCLE_RUNNING,
     CIRCLE_COMPLETE,
diff --git a/src/zynq_checker.py b/src/zynq_checker.py
index a7e8569..f231551 100644
--- a/src/zynq_checker.py
+++ b/src/zynq_checker.py
@@ -87,7 +87,9 @@ def check_zynq_jtag(config: Config, callback: Callable | None = None) -> ZynqChe
         callback("start", "Connecting to hw_server...")
 
     # Find vivado executable
-    vivado_path = _get_vivado_path(config.vitis_path)
+    vivado_path = _get_vivado_path(
+        config.vitis_path if hasattr(config, 'vitis_path') else ""
+    )
     if not vivado_path:
         return ZynqCheckResult(
             devices=[],