diff --git a/qutebrowser/commands/command.py b/qutebrowser/commands/command.py
index 3504edf2e..f6791b0aa 100644
--- a/qutebrowser/commands/command.py
+++ b/qutebrowser/commands/command.py
@@ -169,7 +169,8 @@ class Command:
             if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD:
                 posargs.append(value)
             elif param.kind == inspect.Parameter.VAR_POSITIONAL:
-                posargs += value
+                if value is not None:
+                    posargs += value
             elif param.kind == inspect.Parameter.KEYWORD_ONLY:
                 kwargs[param.name] = value
             else: