diff --git a/lua/noice/lsp/signature.lua b/lua/noice/lsp/signature.lua
index e775d86..54374a7 100644
--- a/lua/noice/lsp/signature.lua
+++ b/lua/noice/lsp/signature.lua
@@ -150,10 +150,10 @@ function M:active_parameter(sig_index)
     return
   end
   local sig = self.signatures[sig_index]
-  if sig.activeParameter and sig.parameters[sig.activeParameter + 1] then
+  if sig.activeParameter and sig.parameters and sig.parameters[sig.activeParameter + 1] then
     return sig.parameters[sig.activeParameter + 1]
   end
-  if self.activeParameter and sig.parameters[self.activeParameter + 1] then
+  if self.activeParameter and sig.parameters and sig.parameters[self.activeParameter + 1] then
     return sig.parameters[self.activeParameter + 1]
   end
   return sig.parameters and sig.parameters[1] or nil