Fix parameter size check.

Author: cpfiffer

src/AdvancedMH.jl

@@ -67,7 +67,7 @@ function bundle_samples(
 
     # Check if we received any parameter names.
     if ismissing(param_names)
-        param_names = ["Parameter $i" for i in 1:(length(first(vals))-1)]
+        param_names = ["Parameter $i" for i in 1:length(s.init_θ)]
     else
         # Deepcopy to be thread safe.
         param_names = deepcopy(param_names)