diff --git a/src/ffx/ffx_controller.py b/src/ffx/ffx_controller.py
index f2a6633..a6c62f9 100644
--- a/src/ffx/ffx_controller.py
+++ b/src/ffx/ffx_controller.py
@@ -209,7 +209,7 @@ class FfxController():
 
         filterParamTokens.extend(denoiseFilters[0]['tokens'] if denoiseFilters else [])
 
-        filterTokens = ['-vf', ', '.join(filterParamTokens)]
+        filterTokens = ['-vf', ', '.join(filterParamTokens)] if filterParamTokens else []
 
 
         commandTokens = FfxController.COMMAND_TOKENS + ['-i', sourcePath]